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

Han character
Han Unification
Unified Han
Unihan

    (From the Han dynasty, 206 B.C.E to 25 C.E.)  One
   of the set of glyphs common to Chinese (where they are
   called "hanzi"), Japanese (where they are called kanji), and
   Korean (where they are called hanja).

   Han characters are generally described as "ideographic", i.e.,
   picture-writing; but see the reference below.

   Modern Korean, Chinese and Japanese fonts may represent a
   given Han character as somewhat different glyphs.  However, in
   the formulation of Unicode, these differences were folded,
   in order to conserve the number of code positions necessary
   for all of CJK.  This unification is referred to as "Han
   Unification", with the resulting character repertoire
   sometimes referred to as "Unihan".

   Unihan reference at the Unicode Consortium
   (http://charts.unicode.org/unihan.html).

   [John DeFrancis, "The Chinese Language: Fact and Fantasy",
   University of Hawaii Press, 1984].

   (1998-10-18)