A term used to variously describe the equipment, location and callsign from which an amateur radio or other radio operator transmits.
A stack of radio transmitter gear in the corner of an office represents the operator's physical station, or "ham shack."
The location where the FCC license is issued is also referred to as the station, regardless of whether there is permanent equipment placed there.
When the operator is on the air, they can announce themselves as "amateur radio station" and then their callsign, from whatever equipment they happen to be using and wherever they are, because the station also refers to the license holder.