In typography, italic type is a cursive typeface based on a stylized form of calligraphic handwriting. Owing to the influence from calligraphy, such typefaces often slant slightly to the right. Different glyph shapes from roman type are also usually used—another influence from calligraphy. True italics are therefore distinct from oblique type, in which the font is merely distorted into a slanted orientation. However, uppercase letters are often oblique type or swash capitals rather than true italics.
This style is called "italic" for historical reasons. Calligraphic typefaces started to be designed in Italy, for chancery purposes. Ludovico Arrighi and Aldus Manutius (both between the 15th and 16th centuries) were the main type designers involved in this process at the time.
"Italics are the print equivalent of underlining" and typewriter users underlined words that would normally appear as italics in professionally printed works.
Italic type was first used by Aldus Manutius and the Aldine Press in 1501, in an edition of Virgil dedicated to Italy. According to Lynne Truss, Manutius invented the italic typeface. Based on the Humanist cursive script first developed in the 1420s by Niccolò de' Niccoli, it served as a condensed type for simple, compact volumes. The punches for these types were cut by Francesco da Bologna (whose surname was Griffo). In 1501 Aldus wrote to his friend Scipio:
We have printed, and are now publishing, the Satires of Juvenal and Persius in a very small format, so that they may more conveniently be held in the hand and learned by heart (not to speak of being read) by everyone.
Unlike the italic type of today, the capital letters were upright roman capitals which were shorter than the ascending lower-case italic letters and used about 65 tied letters (ligatures) in the Aldine Dante and Virgil of 1501.
This Aldine italic became the model for most italic types. It was very popular in its own day and was widely (and inaccurately) imitated. The Venetian Senate gave Aldus exclusive right to its use, a patent confirmed by three successive Popes, but it was widely counterfeited. The Italians called the character Aldino, while others called it Italic.
The slanting italic capital was first introduced by printers in Lyon and is now used in nearly all italic fonts.
An example of normal (roman) and true italics text:
The same example, as oblique text:
Some examples of possible differences between roman and italic type, besides the slant, are below. The transformations from roman to italics are illustrated.
- a "round" or one-storey a,
- an e whose bowl is curved rather than pointed,
- an f with a tail (known as a descender),
- a k with a looped bowl, a k with a ball terminal,
- a p with an intersection at the stem (ascender),
- a v and w with swashes and curved bottoms,
- and a z with the stress on the horizontal strokes as opposed to the diagonal vertical one.
None of these differences are required in an italic; some, like the p variant, do not show up in the majority of italic fonts, while others, like the a and f variants, are in almost every italic. Other common differences include:
- Double-loop g replaced by single-loop version.
- Different closing height where the forked stroke intersects with the stem (e.g. : a, b, d, g, p, q, r, þ).
- Bracketed serifs (if any) replaced by hooked serifs.
- Tail of Q replaced by tilde (as in, for example, the Garamond typeface).
Less common differences include a descender on the z and a ball on the finishing stroke of an h, which curves back to resemble a b somewhat. Sometimes the w is of a form taken from old German typefaces, in which the left half is of the same form as the n and the right half is of the same form as the v in the same typeface. There also exist specialized ligatures for italics, such as a curl atop the s which reaches the ascender of the p in sp.
In addition to these differences in shape of letters, italic lowercases usually lack serifs at the bottoms of strokes, since a pen would bounce up to continue the action of writing. Instead they usually have one-sided serifs that curve up on the outstroke (contrast the flat two-sided serifs of a roman font). One uncommon exception to this is Hermann Zapf's Melior. (Its outstroke serifs are one-sided, but they don't curve up.)
Outside the regular alphabet, there are other italic types for symbols:
- Ampersand resembles eTil ligature more than the Roman version (e.g.: ITC Garamond)
- Asterisk is rotated instead of slanted (e.g.: Bookman Old Style, ITC Garamond).
- Question mark resembles a reversed Latin S.
When to use
- Emphasis: "Smith wasn't the only guilty party, it's true".
- The titles of works that stand by themselves, such as books (including those within a larger series), albums, plays, or periodicals: "He wrote his thesis on The Scarlet Letter". Works that appear within larger works, such as short stories, poems, or newspaper articles, are not italicized, but merely set off in quotation marks.
- The names of ships: "The Queen Mary sailed last night."
- Foreign words, including the Latin binomial nomenclature in the taxonomy of living organisms: "A splendid coq au vin was served"; "Homo sapiens".
- Mentioning a word as an example of a word rather than for its semantic content (see use–mention distinction): "The word the is an article".
- Using a letter or number mentioned as itself:
- John was annoyed; they had forgotten the h in his name once again.
- When she saw her name beside the 1 on the rankings, she finally had proof that she was the best.
- Using a letter or number mentioned as itself:
- Introducing or defining terms, especially technical terms or those used in an unusual or different way: "Freudian psychology is based on the ego, the super-ego, and the id."; "An even number is one that is a multiple of 2."
- Sometimes in novels to indicate a character's thought process: "This can't be happening, thought Mary."
- Algebraic symbols (constants and variables) are conventionally typeset in italics: "The solution is x = 2."
- Symbols for physical quantities and mathematical constants: "The speed of light, c, is approximately equal to 3.00×108 m/s."
Oblique type (or slanted, sloped) is roman type which is optically skewed, but lacking the individual letter forms and cursive accoutrements of true italics.
In many computing interfaces, the text leaning effect is called Italic, whether or not an italic font is used to render the text. The start of this confusion possibly appeared when Adrian Frutiger named the slanted versions of his typefaces Univers and Frutiger as italic. In the case of Univers, only Univers 65 Bold has an italic-named counterpart. Since then, many font families, primarily sans-serif fonts, have called the oblique fonts italic. Although updated versions of those font families begin to incorporate italic features, some font families, such as Avenir Next, Linotype Univers, Neue Helvetica, do not. In expansions of some existing font families (e.g.: Helvetica), the newly introduced fonts are named italic (Helvetica Hebrew, Helvetica Thai), while existing fonts are still called oblique. The name 'Inclined' is also used to name oblique type fonts (e.g.: Helvetica Greek).
Although an oblique font can be generated by simply tilting the base font, some designers use optical correction to correct the distorted curves this introduces. Some font families have fonts with both italic and oblique variants. In these cases, the oblique font may have a different tilt angle from the italic font. For example, Univers 65 Bold Oblique has a smaller leaning angle than the Univers 66 Bold Italic.
Italics within italics
If something within a run of italics needs to be italicized itself, the type is normally switched back to non-italicized (roman) type: "I think The Scarlet Letter had a chapter about that, thought Mary". In this example, the title ("The Scarlet Letter") is within an italicized thought process and therefore this title is non-italicized. It is followed by the main narrative that is outside both. It is also non-italicized and therefore not obviously separated from the former. The reader must find additional criteria to distinguish between these. Here, apart from using the attribute of italic–non-italic styles, the title also employs the attribute of capitalization. Citation styles in which book titles are italicized differ on how to deal with a book title within a book title; for example, MLA style specifies a switch back to roman type, whereas The Chicago Manual of Style (8.184) specifies the use of quotation marks (A Key to Whitehead’s "Process and Reality").
In certain Arabic fonts (e.g.: Adobe Arabic, Boutros Ads), the italic font has the top of the letter leaning to the left, instead of leaning to the right. Some font families, such as Venus, Roemisch, Topografische Zahlentafel, include left leaning fonts and letters designed for German cartographic map production, even though they do not support Arabic characters.
Iranic font style
The Chicago Manual of Style suggests that to avoid problems such as overlapping and unequally spaced characters, parentheses and brackets surrounding text that begins and ends in italic or oblique type should also be italicized (as in this example). An exception to this rule applies when only one end of the parenthetical is italicized (in which case roman type is preferred, as on the right of this example).
In The Elements of Typographic Style, however, it is argued that since Italic delimiters are not historically correct, the upright versions should always be used, while paying close attention to kerning.
In media where italicization is not possible, alternatives are used as substitutes:
- In typewritten or handwritten text, underlining is typically used.
- In plain-text computer files, including e-mail communication, italicized words are often indicated by surrounding them with slashes or other matched delimiters. For example:
- I was /really/ annoyed.
- They >completely< forgot me!
- I had _nothing_ to do with it. (Commonly interpreted as underlining, which is an alternative to italics.)
- It was *absolutely* horrible. (Commonly interpreted as bold.)
- Where the italics do not indicate emphasis, but are marking a title or where a word is being mentioned or defined as a direct object, quotation marks may be substituted:
In HTML, the
i element is used to produce italic (or oblique) text. When the author wants to indicate emphasized text, modern Web standards recommend using the
em element, because it conveys that the content is to be emphasized, even if it cannot be displayed in italics. Conversely, if the italics are purely ornamental rather than meaningful, then semantic markup practices would dictate that the author use the Cascading Style Sheets declaration
font-style: italic; along with an appropriate, semantic class name instead of an
- Truss, Lynne (2004), Eats, Shoots & Leaves: The Zero Tolerance Approach to Punctuation, New York: Gotham Books, p. 146, ISBN 1-59240-087-6 [Amazon-US | Amazon-UK]
- Truss, Lynne (2004), Eats, Shoots & Leaves: The Zero Tolerance Approach to Punctuation, New York: Gotham Books, p. 77, ISBN 1-59240-087-6 [Amazon-US | Amazon-UK]
- Berthold Louis Ullman, The origin and development of humanistic script, Rome, 1960, p. 77
- Updike, D.B. (1927), Printing Types: Their History, Form and Use, Harvard University
- University of Minnesota Style Manual, University of Minnesota, July 18, 2007, retrieved October 22, 2009
- Mills, I. M.; Metanomski, W. V. (December 1999), On the use of italic and roman fonts for symbols in scientific text (PDF), IUPAC Interdivisional Committee on Nomenclature and Symbols, retrieved 9 November 2012. This document was slightly revised in 2007 and full text included in the Guidelines For Drafting IUPAC Technical Reports And Recommendations and also in the 3rd edition of the IUPAC Green Book.
- See also Typefaces for Symbols in Scientific Manuscripts, NIST, January 1998. This cites the family of ISO standards 31-0:1992 to 31-13:1992.
- "More on Printing and Using Symbols and Numbers in Scientific and Technical Documents". Chapter 10 of NIST Special Publication 811 (SP 811): Guide for the Use of the International System of Units (SI). 2008 Edition, by Ambler Thompson and Barry N. Taylor. National Institute of Standards and Technology, Gaithersburg, MD, U.S.A.. March 2008. 76 pages. This cites the ISO standards 31-0:1992 and 31-11:1992, but notes "Currently ISO 31 is being revised [...]. The revised joint standards ISO/IEC 80000-1—ISO/IEC 80000-15 will supersede ISO 31-0:1992—ISO 31-13.".
- Esfahbod, Behdad; Roozbeh Pournader (March 2002). "FarsiTeX and the Iranian TeX Community" (PDF). TUGboat 23 (1): 41–45. Retrieved 3 January 2013.