Wrapper

From Ultrafractal Wiki

A Wrapper is a PlugIn that wraps around or holds several other PlugIns. For example, TrapShape Merge is a wrapper that has 10 PlugIn Slots that can each hold a Trap Shape or TrapShape Block.

see Merging and Wrapping for some explanation

a partial list of Wrappers:

   Convolution Color Wrapper
   Trap Shape Wrapper 
   Convolution Shape Wrapper
   Transform Merge
   ColorTrapShape Block
   TrapShape Block