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Operators that do not need any inputs connected (to create a meaningful output) are called Generators in TouchDesigner, like a Pattern CHOP. "Inputs" are both the wires from other operators, and OP References to other operators in OP parameters.

Generators are the darker shaded operators in the OP Create Dialog.

See their counterparts Filters.

Operators may have inputs defined by Parameters that are Path references, that are from any Operator Family.