As I complete the masthead for a book, I see that the publisher has sent me a
.png for the new (to me) "printed on acid free paper" symbol — there's a version of it on Wikipedia,
but after a quick and lazy search I haven't found any discussion about the history or status of the symbol.
I also don't find "acid" in the Unicode character index (accessed 20120919), so I'm guessing this thing hasn't made it into Unicode yet.
Is there a standard LaTeX command to generate it? Or shall I make do with
Edit: The forms I've seen look like the Arabic numeral 8 rotated counterclockwise 90° and placed in a circle. I wonder if an infinity sign is not actually what is intended, rather than an eight. But I'm not sure who to ask.
Edit 2: Actually, the publisher has identified it as U+267E, so that gives me another way to enter it. In the several fonts where OS 10.8 finds it present, it is indeed an infinity-sign inside.