A map of the default set of vim digraphs, colored based on my own categorization. A bit unfinished.
Latin supplement
Latin extended
Greek and Coptic
Greek extended
Cyrillic
Hebrew
Arabic
Hiragana
Katakana
Bopomofo
Other
Control characters
Punctuation
CJK symbols and punctuation
Mathematical operators
Superscripts and subscripts
Currency symbols
Other letterlike
Roman numbers
Arrows
Box drawing
Block elements
Geometric shapes
Technical
Symbols
Music symbols
Dingbats
Other 2