"Position", as FlyingStone mentioned, is common if you havn't been in contact with the controlling, or recording, facility.
Eg, in some countries you contact them 5-10 minutes prior to FIR boundary. Is the next FIR radar or non-radar? Both non radar and radar request you to report the entry fix. Radar boundary? "Control, AB 123, MATRX, FL 370." Entering a non radar FIR? "Control, AB 123, position." This gives the controller a heads up to be ready for the full position report.
Overwater on HF? "Control, AB 123 position on 89" (eg HF freq 8925).