avida-ed-library-build/docs/documentation/glossary/Glossary--Nop-Head-Notation.md

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<title>Other Notation : Nop-Head-Notation</title>
<h1>Nop-Head-Notation</h1>
A <a href="help.Heads.html">head</a> abbreviation (IP, RH, WH, or FH) surrounded by question marks refers to that head being used as a default, when the <a href="help.Instruction.html">instruction</a> in question is being executed, but if the instruction is followed by a <a href="help.nop-instructions.html">no-operation</a> (nop) instruction, the nop will alter the register used. A nop-A instruction indicates the instruction pointer (IP), nop-B is the read-head (RH), nop-C is the write-head (WH), and there is no way to use the flow-head (FH) unless it is by default.