Probably referring to so-called "Han unification" which tried to use same codepoints for different glyphs to reduce code space for ideograms derived from Chines

Probably referring to so-called "Han unification" which tried to use same codepoints for different glyphs to reduce code space for ideograms derived from Chinese ones. But that only causes confusion because you need to provide external information which way to interpret them, just like a code page