SV: Systems Validation, sometimes called GV: Ground Validation

PV: Procedures Validation (checklist flows in a Matrix trainer)

MV: Maneuvers Validation

KV: Knowledge Validation (check ride oral)

LOE is your check ride in the SIM

At some airlines you’re required to have your KV and LOE same day.

At my previous airline (SkyWest), all Validation are PRIA.