It varies from organization to organization...
Tau Beta Sigma's recognition pin is a miniature version of our crest. And it's more common for sisters to wear the recognition pin than our official pearled badge. We're authorized to wear either in any formal chapter function. There are two versions of it...
(I have the above one, with my chapter guard).
And a larger, colorized one (which I've never seen in person):
There are also a couple of lapel pins with the letters of the organization.
I don't even own a pearl badge. I want to, though...
~ Mel.