The Vertical Members of a Door Frame is Known as

The vertical members of a door frame is known as post.

Solution

Posts: These are the vertical members of the door frame provided which supports the door opening. Side jambs are affixed to the wall face which is useful for door opening and locking.

Sill: This is a bottom-most horizontal portion of a door frame which is fastened to the floor. It is also useful to prohibit the bending of vertical members of the frame during and after the construction process.

Rails: These are the horizontal members of the door which are substantial to consider for hardware mounted to the top of bottom of the door. 

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