General category "Punctuation, Close" (Pe)
General category "Punctuation, Connector" (Pc)
General category "Other, Control" (Cc)
General category "Symbol, Currency" (Sc)
General category "Punctuation, Dash" (Pd)
General category "Number, Decimal Digit" (Nd)
General category "Mark, Enclosing" (Me)
General category "Punctuation, Final quote" (Pf)
General category "Other, Format" (Cf)
General category "Punctuation, Initial quote" (Pi)
General category "Number, Letter" (Nl)
General category "Separator, Line" (Zl)
General category "Letter, Lowercase" (Ll)
General category "Symbol, Math" (Sm)
General category "Letter, Modifier" (Lm)
General category "Symbol, Modifier" (Sk)
General category "Mark, Nonspacing" (Mn)
General category "Punctuation, Open" (Ps)
General category "Letter, Other" (Lo)
General category "Number, Other" (No)
General category "Punctuation, Other" (Po)
General category "Symbol, Other" (So)
General category "Separator, Paragraph" (Zp)
General category "Other, Private Use" (Co)
General category "Separator, Space" (Zs)
General category "Mark, Spacing" (Mc)
General category "Other, Surrogate" (Cs)
General category "Letter, Titlecase" (Lt)
General category "Other, Not Assigned" (Cn)
General category "Letter, Uppercase" (Lu)
These are the possible character classifications from the Unicode specification. See Unicode Character Database.