Gatepost n. : A post to which a gate is hung; -- called also swinging / hinging post.

Gatepost n. : A post against which a gate closes; -- called also shutting post.

Example:
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Taxonomy
gateposts, stile, gates, North Ayrshire, Farm, crossbars, lodges, entrance, East Ayrshire, free encyclopedia, Gatehouses, driveway, designs, square, Ayrshire, the Lodge, Scotland, made of wood.

Defination from the web:
gatepost is utilitarian in purpose then gateposts will be made as strictly functional structures; however as part of the 'advertisement' ... A goose atop a gatepost at Overtoun Farm, North Ayrshire. An unusual stile at The Kerse, Beith, North Ayrshire. An old gateway in Eskdale, Cumbria ...