I found it in an old dictionary and I'm not sure what it means. It looks like the number "3", but the top of the three has been flattened(and slightly curved).
I've only seen this in three or four words.
English Language & Usage Stack Exchange is a question and answer site for linguists, etymologists, and serious English language enthusiasts. It only takes a minute to sign up.Sign up to join this community
I can't follow that link to anything useful, but pending the addition of a picture to the question I'll provisionally suggest that what you describe sounds like it is could just about be the letter yogh (capital Ȝ, lowercase ȝ), but more likely the letter ezh (capital Ʒ, lowercase ʒ).
ʒ was invented for a system of English phonetics, and survives in the IPA.
There was also an old scribal abbreviation for the unit dram/drachm that was so close to ʒ in appearance that the symbols are essentially merged at least as far as modern computing use goes (though some use ȝ rather than ʒ there).