...and speaking (? piling on ?) re ikegami's note re the link,
kuratkull: Could you tell us, please, what the dickens "all lower caps" means, because what's echoing through my minds is that "lower (case) CAPITALS" is an oxymoron of the first order.

"Small Caps" is a legit (ie, "meaningful") phrase, but isn't relevant in any way to your question (It's a designation for a font style with letters that look like conventional capital - upper case - letters, but are less tall). However, "small caps" is NOT a character-set in the meaning of your question.