The more you know.
This is Diamond Dallas Page (DDP). He made that symbol because of the Diamond in his name. His finisher was called the Diamond Cutter. He was using the hand gesture in the mid 90's and was smart enough to trademark it.
Some Rappers are big wrestling fans. Some songs reference wrestlers and occasionally you will see old ass Ric Flair pop up in a music video.
Jay Z started using the Diamond hand gesture and tired to trademarked it for Roc A Fella Records. Roc is also slang for diamonds.
Well Jay Z had 99 problems and a lawsuit by DDP over the hand symbol was one.
Diamond Dallas Sues Jay-Z Over 'Diamond Cutter' Hand Sign | News | MTV
Jay Z took the L in court.
Rhianna has ties to Jay Z, and that is probably why she used it or she could be in league with Satan. One or the other.