OpenType is a cross-platform font format developed by Adobe and Microsoft in the late 1990s. It has the faculty to include an expanded character set and layout features to provide richer linguistic support and/or advanced typographic control such as various numeral styles, ligatures, small capitals and contextual substitutions. OpenType supports Unicode, which enables the fonts to contain more than 65,000 glyphs while ʻPostScript®ʼ fonts are technically limited to a maximum of only 256 characters. This means that a user does not need to have separate fonts for Western, Central European or other languages, but could have one single file which supports all these encodings. OpenType fonts, as a new industry standard, will work in all applications, however only some applications take profit of the advanced OpenType features, other applications will only use the first 256 characters.
OpenType Features
picto Standard Ligatures [LIGA]

Numbers from 00 to 100 are automatically regrouped into all single shapes when "Ligatures" is turned on.  

Standard Ligatures [LIGA]
picto Fractions [FRAC]

Turns on fractions. All OpenType fonts from Optimo have at least three basic pre-built fractions (1/2, 1/4, 3/4).

Fractions [FRAC]
picto Ordinals [ORDN]

Replaces regular glyphs (not numerals) to with their matching superiors glyphs. All Optimo fonts have the masculine and feminine ordinals required for Spanish segunda/segundo (2a, 2o).

Ordinals [ORDN]
picto Superscript/Superior [SUPS]

Substitutes figures 1, 2 and 3 with their superior forms. These designed glyphs match the weight of the regular numbers and are more legible than scaled characters.

Superscript/Superior [SUPS]
picto Contextual Alternates [CALT]

The CALT feature gives the direct access to the pictograms by typing a simple reference (e.g. p1.1). See the complete list of references below. This feature is usually on by default in Adobe applications and QuarkXpress.

Contextual Alternates [CALT]
picto Contextual Alternates [CALT]

Complete list of references

Contextual Alternates [CALT]
picto Contextual Alternates [CALT]

This feature also gives the access to the horizontal arrows by typing a specific combination of characters on your keyboard (e.g. ‘hyphen + greater-than’ or ‘hyphen + less-than’).

The letter ‘x’ placed after a number will be replaced by the ‘multiplication’ glyph.

Contextual Alternates [CALT]