The Free On-line Dictionary of Computing (30 December 2018):

Unicode

   1.  A 16-bit character set standard, designed and
   maintained by the non-profit consortium Unicode Inc.

   Originally Unicode was designed to be universal, unique, and
   uniform, i.e., the code was to cover all major modern written
   languages (universal), each character was to have exactly one
   encoding (unique), and each character was to be represented by
   a fixed width in bits (uniform).

   Parallel to the development of Unicode an ISO/IEC
   standard was being worked on that put a large emphasis on
   being compatible with existing character codes such as ASCII
   or ISO Latin 1.  To avoid having two competing 16-bit
   standards, in 1992 the two teams compromised to define a
   common character code standard, known both as Unicode and
   BMP.

   Since the merger the character codes are the same but the two
   standards are not identical.  The ISO/IEC standard covers only
   coding while Unicode includes additional specifications that
   help implementation.

   Unicode is not a glyph encoding.  The same character can be
   displayed as a variety of glyphs, depending not only on the
   font and style, but also on the adjacent characters.  A
   sequence of characters can be displayed as a single glyph or a
   character can be displayed as a sequence of glyphs.  Which
   will be the case, is often font dependent.

   See also Jörgen Bettels and F. Avery Bishop's paper Unicode:
   A universal character code

(http://research.compaq.com/wrl/DECarchives/DTJ/DTJB02/DTJB02SC.TXT).

   (2002-08-06)

   2.  A pre-Fortran on the IBM 1130, similar to
   MATH-MATIC.

   [Sammet 1969, p.137].

   (2004-09-14)