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# stixfonts
OpenType Unicode fonts for Scientific, Technical, and Mathematical texts
## About the STIX fonts.
See https://www.stixfonts.org/ for background on the the STIX Fonts project.
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 1.1.
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](https://tiro.com). 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](https://www.stixfonts.org/) began through the joint
efforts of
the [American Mathematical Society](https://www.ams.org/) (AMS),
the [American Institute of Physics](https://www.aip.org/) (AIP),
the [American Physical Society](https://www.aps.org/) (APS),
the [American Chemical Society](https://www.acs.org/) (ACS),
the [Institute of Electrical and Electronic](https://www.ieee.org/) Engineers (IEEE),
and [Elsevier](https://www.elsevier.com/).
These companies are collectively known as the STI Pub companies.
### A Fresh Take on Times Roman
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.”
### Font implementation decisions
* The STIX fonts do not contain fixed-width or sans serif text faces.
* The sans serif, fraktur, script, etc., alphabets in Plane 1
(U+1D400-U+1D4FF) are intended to be used only as technical symbols.
* 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.
### Note to TeX users
These fonts have been tested with both
[XeTeX](http://xetex.sourceforge.net/)
and
[luaTeX](http://www.luatex.org/)
with good results. For best results, XeTeX users will want to use
version 0.99999 or later of XeTeX, which ships with
[TeXLive 2018](https://www.tug.org/texlive/).
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](https://ctan.org/pkg/amsmath).
## Summary of OpenType Features and Scripts
Further details these features can be found in the code 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
|
