Coboundary Operator
Each of the maps of a cochain complex
| ...->C^(i-1)->^(d^(i-1))C^i->^(d^i)C^(i+1)->... |
is known as a coboundary operator.
See also
Boundary OperatorThis entry contributed by Margherita Barile
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Barile, Margherita. "Coboundary Operator." From MathWorld--A Wolfram Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/CoboundaryOperator.html