Template: A gauge, pattern, or mold (such as a thin plate or board) used as a guide to the form of a piece being made; an overlay; something that establishes or serves as a pattern. Templates are used for mapping the different sections of the piano.
When we were working on all this, we kept needing to talk about the A3/A4 octave. Over time, it just became easier to use the words ‘Prime octave’ instead of saying the A3/A4 octave.
Mapping (and tuning) notes during the mapping process is the equivalent of setting the temperament in aural-only tuning.