Packaging symbols in one simple font
OpenType is a cross-platform font file format developed by Adobe and Microsoft. The same OpenType font can be used in both Macintosh and Windows computers.
OpenType feature support lies in the distinction between characters and glyphs. Characters are the code points assigned by the Unicode standard, which represent the smallest semantic units of language, such as letters. Glyphs are the specific forms that those characters can take. One character may correspond to several glyphs; the lowercase "a," a small cap "a" and an alternate swash lowercase "a" are all the same character, but they are three separate glyphs. One glyph can also represent multiple characters, as in the case of the "ffi" ligature, which corresponds to a sequence of three characters: f, f and i.
OpenType layout features can be used to position or substitute glyphs. For any character, there is a default glyph and positioning behavior. The application of layout features to one or more characters may change the positioning, or substitute a different glyph. For example, the application of the small capitals feature to the "a" would substitute the small cap "a" glyph for the usual lowercase "a" glyph. To access alternate glyphs in an OpenType Pro font, an application provides a user interface that allows end users to apply OpenType layout features to text. Applications that don't support Unicode or advanced OpenType layout features can still access the basic glyph sets of OpenType Pro fonts, which are analogous to the glyph sets in PostScript Type 1 fonts.
PackSymbol fonts depend on the advanced OpenType features to substitute the required packaging symbol when required keyword is typed in an OpenType supported application, such as InDesign, Illustrator or QuarkXpress. For example for the symbol for Biological Risks is automatically obtained by typing biological risks.