Pylon

noun

1. A gateway to the inner part of an Ancient Egyptian temple.
2. A tower-like structure, usually one of a series, used to support high-voltage electricity cables.
3. A structure used to mount engines, missiles etc., to the underside of an aircraft wing or fuselage.
4. A starting derrick for an aeroplane.
5. A post, tower, etc. as on an aerodrome, or flying ground, serving to bound or mark a prescribed course of flight.