Spiral

 Spiral (スパイラル Supairaru) is an archetype of Spell and Trap Cards. Usually related in effect and design, they take the role of  within various series. .

Naming
The name "Spiral" is in reference to the spinning portal used whenever a monster is Fusion Summoned. The Polymerization-like portal in "" and the violet-colored portal in Yu-Gi-Oh! S and onward being the most prominent examples.

The choice of name also comes from the Spiral Gang in Yu-Gi-Oh! Underground, a group of Duelists who only use the Fusion Summon method.