There is no special support for Unicode fonts in the official PostScript language specification . (And this is the final version of the specification for PS Level 3, valid since its publication in 1999 - PostScript is no longer being developed as a language ...)
However, PostScript supports (starting at level 2) multibyte fonts (2-, 3-, and 4-bytes) in a general way (see "CID"). All PostScript fonts need to be "encoded": basically, the encoding is a table that shows the position of the font index, and the description of the glyph for this character. Thus, although there are no Unicode fonts as such, there are multibyte CID fonts that provide a subset of the unicode range.
, CMaps. (CMap.) CMap, Windows Adobe CMap.
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CID-. . ( 364ff PLRM)
: CID.