Here are three terms I use for OP systems, in case they are helpful to anyone:
Tunnel: a handy SINGLE word to describe a combined buffer and target. Example: Traditional Old Pochmann uses BD as its edge tunnel and EV (or AP) as its corner tunnel.
Sticker Election: the choice of stickers you elect to use for a given tunnel. For instance, some people elect AP for the Old Pochmann corner alg, while others elect EV. The alg is the same. Buffer election affects the letter string; target election affects setups.
Dummies: the two edge pieces that swap back and forth while you solve corners, or the two corner pieces that swap back and forth while you solve edges