We're about to run out of ASCII symbols, and I'd really prefer not to use <, >, and & (since they have special meaning in HTML.) May I suggest parethesized groups of letters? (A), (B), (C)... (a), (b), (c)..., and then if we're still here go to (AA), (BB), (CC)... (aa), (bb), (cc)... and then (A1), (A2), ... I'd rather not get into parenthesized punctuation either. If you've already planned for this, never mind.