i remember reading somewhere that the pin that Cliff wears on his shirt ever episode after a certain time with the letter "SD" on it. Can any one remember what it stood for, I think it stands for "Sammy Davis" or some other entertainer that died, but i'm not sure. Does anyone kno?

The "SD" pin does stand for Sammy Davis Jr.

Cosby began wearing it on the show after the entertainer passed away.

Thanks alot.

Sammy Davis Jr. (SD) appeared in the episode No Way, Baby in the 5th season