Stopper (Scrabble)

A Stopper is a decoy letter that's usually seen on the game show called Scrabble for which in turn it was based on the world-famous classic board game of the same name.

History
Usually seen in the Crossword round, if one of the two contestants found one of the "stoppers" then control along with any used letters were passed onto their opponent. However, if all three "stoppers" were found, then the contestant that did not try to place the letter was given a chance to guess the puzzle. The "stoppers" would usually explode and appear as small-looking red stop signs.

Trivia
The word "Stopper" would later be used for another game show called Lingo for which was also hosted by Chuck Woolery on Game Show Network/GSN from 2002 until 2007.

Show appeared
Scrabble (1984-1990 & 1993)