OpenType Unicode fonts for Scientific, Technical, and Mathematical texts
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See https://www.stixfonts.org/ for background on the the STIX Fonts project.
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Download the current version of the OTF, WOFF, and WOFF2 files in a zip archive.
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View code charts for the
- Math,
- Regular text,
- Italic,
- Bold, and
- Bold Italic fonts.
The STIX Two fonts are OpenType fonts and are meant to be used in that format. For the benefit of LaTeX users who are unable to use XeTeX or luaTeX, we have also provided version 2.0.0 of the STIX fonts as a set of TFM files and Type 1 fonts. These are also available as a separate zip file.
Note that no further updates are planned to the Type 1 distribution; future development efforts will focus on improving the OpenType fonts. Patches to the existing Type 1 distribution are welcome and, pending review, will be incorporated into the distribution.
The Scientific and Technical Information eXchange (STIX) fonts are intended to meet the demanding needs of authors, publishers, printers, and others in the scientific, medical, and technical fields. They combine a comprehensive Unicode-based collection of mathematical symbols and alphabets with a set of text faces suitable for professional publishing. They are available royalty-free under the SIL Open Font License.
Version 2 of the STIX fonts, now known as “STIX Two”, is a thorough revision of version 1 undertaken by the renowned type house Tiro Typeworks. The STIX Two fonts consist of four text fonts (Regular, Italic, Bold, and Bold Italic) and one Math font. Together, they provide a uniform set of fonts that can be used throughout the production process, whether that be a traditional print-only process, an entirely electronic one, or a combination of the two.
The STIX project began through the joint efforts of the American Mathematical Society (AMS), the American Institute of Physics (AIP), the American Physical Society (APS), the American Chemical Society (ACS), the Institute of Electrical and Electronic Engineers (IEEE), and Elsevier. These companies are collectively known as the STI Pub companies.
The original version of STIX was based on Times Roman, which has now been updated for the digital age.
As is well known, Times Roman was originally intended for printing the London Times. What is not generally appreciated is that the production quality of the Times was atypically high: It was printed on unusually high-quality paper on presses that operated more slowly than most newspaper presses. This allowed for the design of a typeface that could exploit this level of care: serifs could be much finer and counters (enclosed areas such as that in the lowercase e) could be much smaller than in other newspaper typefaces. These features of the font have not always fared well in less exacting environments. At the same time, a notable quirk of the Times Roman family is that the bold font is, in many respects, strikingly dissimilar to the roman font.
Tiro Typeworks explain their approach to updating the Times Roman basis of STIX as follows:
“Our principal goal in approaching STIX Two was to address several inherent deficiencies in the Times New Roman model as well as expand the typographic features. This process necessarily involved diverging somewhat from Times as familiar to people who have only known the common digital versions, while simultaneously restoring to that typeface aspects of the size-appropriate design characteristics that made it so successful in newspaper, book, and journal publishing in it’s metal type incarnation. The essential ‘Times-ness’ remains, but are with greater harmonisation of style across the family.
“Most digital versions of Times have been based on an optical size model that appears too light and fine when scaled down to typical text sizes. In the design of STIX Two, we went back to specimens of size-specific designs from the metal era, and adapted proportions, weights, and spacing of the 10pt and 12pt designs. The oft-noted mismatch between the style of different weights of Times has been resolved with a new bold design that matches the construction of the regular weight.”
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The STIX fonts do not contain fixed-width or sans serif text faces.
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The sans serif, fraktur, script, etc., alphabets in Plane 1 (U+1D400-U+1D4FF) are intended to be used only as technical symbols.
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These fonts are designed to support left-to-right typesetting in Latin-based scripts, with additional support for Greek and Cyrillic text. Extensions to support other writing directions have been considered, but are currently deemed to be outside the scope of the STIX project.
These fonts have been tested with both XeTeX and luaTeX with good results. For best results, XeTeX users will want to use version 0.99999 or later of XeTeX, which ships with TeXLive 2018. This version fixes a number of bugs that were present in earlier versions. Our thanks go out to Jonathan Kew and Khaled Hosny for their generous help in identifying and fixing these bugs. LaTeX users should also make sure they have the latest version of the amsmath package.
Further details these features can be found in the font charts.
The four text fonts implement the following OpenType script tags:
Regular Bold Italic BoldItalic
DFLT DFLT DFLT DFLT Default
cyrl cyrl cyrl cyrl Cyrillic
cyrl.MKD cyrl.MKD Cyrillic/Macedonian
cyrl.SRB cyrl.SRB Cyrillic/Serbian
grek grek grek grek Greek
latn latn latn latn Latin
latn.ROM latn.ROM latn.ROM latn.ROM Latin/Romanian
latn.TRK latn.TRK latn.TRK latn.TRK Latin/Turkish
and the following features
c2sc Small Capitals from Capitals
case Case-Sensitive Forms
ccmp Glyph Composition/Decomposition
dnom Denominators
frac Fractions
kern Kerning
liga Standard Ligatures -- latn only
locl Localized Forms -- latn.ROM and Italic/BoldItalic cyrl.MKD only
numr Numerators
onum Oldstyle Figures
pnum Proportional Figures
smcp Small Capitals
subs Subscript
sups Superscript
All four text fonts also support the following Character Variants:
cv01 U+019B Lambda with horizontal, not slanted stroke -- latn only
cv02 U+0264 Rams horn with serifs -- latn only
cv03 U+2423 OPEN BOX curved instead of straight
In addition, the Italic and BoldItalic faces support the following Stylistic Variants:
ss01 Replace two-story g by hooked g -- Italic/BoldItalic only
ss02 Upright parens, brackets, and braces -- Italic/BoldItalic only
STIX Two Math implements the following font features:
ccmp Glyph Composition/Decomposition
dtls Dotless forms of i and j
flac Flattened accents
ssty Math Script style alternates
and the following Character Variant (note the different meaning compared to the text fonts):
cv03 Replace U2205 EMPTY SET by an oblate form
and the following Stylistic Sets (again, note that ss01 and ss02 have different meanings compared to the text fonts):
ss01 Stylistic Set 1 -- Math chancery to roundhand (\mathcal -> \mathscr)
ss02 Stylistic Set 2 -- Alternate italic forms: g, u, v, w, z
ss03 Stylistic Set 3 -- Horizontal crossbar variants
ss04 Stylistic Set 4 -- Minute, second and primes to long variants
ss05 Stylistic Set 5 -- Short arrow variants
ss06 Stylistic Set 6 -- Short/narrow variants
ss07 Stylistic Set 7 -- Alternate math symbols (product, summation, etc)
ss08 Stylistic Set 8 -- Upright integral variants; XITS compatible
ss09 Stylistic Set 9 -- Vertical slash variants; XITS compatible
ss10 Stylistic Set 10 -- Diagonal greater/lesser combination variants
ss11 Stylistic Set 11 -- Long slash not-equal combination variants
ss12 Stylistic Set 12 -- Low contrast (sans-like) variants
ss13 Stylistic Set 13 -- Horizontally flipped sine wave glyph
ss14 Stylistic Set 14 -- Tall variants
ss15 Stylistic Set 15 -- Slab serif symbol variants
ss16 Stylistic Set 16 -- Circled operator variants
ss20 Stylistic Set 20 -- Miscellaneous variants