I think it’s called embossed button..
Is it possible to make one from code?
I mean like the “Sign Up for Facebook” button in the Facebook iPhone app logging screen.
I know three20 have something like that but i want to create one my self

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you can create it easily i think because what you will need is only the embossed image.
drag a
UIButtonto your view and the go to attribute Inspector in you IB then under button section change the type to custom.Now when you have the custom type then assige your embossed image as the background image.
if you are looking for custom code then refer This link