What is "rickles"

Usage examples of "rickles".

She was there to put out fires on a Fantasma-produced Def Jam show and Bill very much wanted to see Frank Sinatra and Don Rickles play the brand-new MGM Grand on the thirtieth.

We know all there is to know about Elvis and Liberace, not to mention such living fossils as Sinatra and Bob Hope and Don Rickles and Wayne Newton -- but Dean Martin?