From SKYbrary Wiki
GCOL: Ground Collision - Collision while taxiing to or from a runway in use.
- Includes collisions with an aircraft, person, animal, ground vehicle, obstacle, building, structure, etc. while on a surface other than the runway used for landing or intended for takeoff.
- Ground collisions resulting from events categorized under Runway Incursion (RI) or Ground Handling (RAMP) are excluded from this category.
NOTE: Taxiing includes ground and air taxiing for rotorcraft.