1) Entrance boundary 2) Fence feature 3) Fence part 4) Garden entrance component 5) Imaginary third confidant 6) Post 
A gatepost is a structure used to support gates or crossbars which control entry to an area, such as a field or driveway. == Purpose == If the gatepost is utilitarian in purpose then gateposts will be made as strictly functional structures; however as part of the `advertisement` of the status of the family who live beyond, they are often careful.....
• (n.) A post to which a gate is hung; -- called also swinging / hinging post. • (n.) A post against which a gate closes; -- called also shutting post.
Gate'post` noun 1. A post to which a gate is hung; -- called also swinging or hinging post . 2. A post against which a gate closes; -- called also shutting post . 
[n] - either of two posts that bound a gate
noun either of two posts that bound a gate