Data Flow Terminology : Symmetries ( conventional, and otherwise )

 Symmetricalising some dataflow terms : 

• - input, output; 0-to-N, Q-to-0; pipe-from-source, -to-sink; generator, consumer;
• - fanout, fanin; N-to-P, P-to-Q; unfold, fold; increase, reduce; infer, filter;
• - map; P-to-P