Spinner is a domino variant that has two major differences from standard dominoes. Firstly, some of the dominoes have a wild symbol for one of the faces. Also, double dominoes are built off of in four directions.
From the Manufacturer
A dyanamic double 9 domino game plus 11 Spinner pieces as wild dominoes. A great combination of other domino games, with the wild Spinner dominoes used to keep the game going. This exciting and popular Spinner dominoes game was invented by Dr. and Mrs. Edna F. Graham of Abiline, Texas in 1983. The spinner dominoes game is manufactured and distributed by Puremco. 55 standard size dominoes with colored dots and 11 extra Spinner dominoes emblazoned with the bold Spinner symbol making it “wild” and playable anywhere. Exciting new tin packaging. The Spinner Dominoes and Tin Package allows 2-8 players.