tl;dr: IOPs, as introduced in [BCS16]1.
Unstructured note
The WHIR paper on pg. 5 mentions the notion of an alphabet for an IOP.
References
For cited works, see below 👇👇
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Interactive Oracle Proofs, by Ben-Sasson, Eli and Chiesa, Alessandro and Spooner, Nicholas, in Theory of Cryptography, 2016Â ↩
PREVIOUSNP relations
NEXTIOPPs