chickadee » srfi-14 » char-set:upper-case

char-set:upper-caseconstant

The upper-case ASCII characters are

 ABCDEFGHIJKLMNOPQRSTUVWXYZ

For Unicode, a character is upper-case if it has a Uppercase property.

Some Unicode upper-case characters:

0391GREEK CAPITAL LETTER ALPHA
0411CYRILLIC CAPITAL LETTER BE
2160ROMAN NUMERAL ONE