nWo/Kliq
 

I noticed during Shawn's entrance at WrestleMania 13 that he was responding to and tapping the nWo hand sign. He did this right in front of Vince and while getting in the ring did it again "hiding" it under his coat.

Is the nWo hand sign the same as the Kliq's? And was Vince ever pissed at Shawn for using it (considering the nWo in WCW and the curtain call at MSG)?

Yes it is. Origionally the Kliq then later used for nWo

In a similar matter, I loved when Hall would do the "suck it" gesture on Nitro sometimes.

Nash did it alot too....I wouldn't have been surprised if when HHH was gonna join the nWo they'd change it to "Kliq"

Yeah, but Bischoff wanted to play up to the WWE, so he didn't care. Vince loathed WCW and didn't want much if anything from "Dubya See Dubya" on his show.