projecting or extendible structures used for stabilization on aerial devices. cranes. and other vehicles that support elevated or outstretched loads.

outriggers (Wikipedia)
Relief of Borobudur Temple (8th century AD) in Central Java, Indonesia, showing a ship with outrigger
Outrigger on a contemporary Hawaiian sailing canoe

An outrigger is a projecting structure on a boat, with specific meaning depending on types of vessel. Outriggers may also refer to legs on a wheeled vehicle which are folded out when it needs stabilization, for example on a crane that lifts heavy loads.

Missile vehicle standing on its outriggers to stabilize launch
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