Unicode code category of Char. This is one of Cc, Cf, Cn, Co, 
Cs, Ll, Lm, Lo, Lt, Lu, Mc, Me, Mn, Nd, Nl, No, Pc, Pd, Pe, Pf, Pi, Po, 
Ps, Sc, Sk, Sm, So, Zl, Zp, Zs. When testing, a single letter stands for 
all its subcategories. E.g. to test form a letter, you can use
unicode_property(C, category('L'))