1. A secondary post in a timber-framed structure or a truss, e.g. queen-post.
2. Short post in a post-and-rail fence between the two standards into which the horizontal rails are mortised: it is pointed and driven into the ground, giving additional stiffness.
"prick-post." A Dictionary of Architecture and Landscape Architecture. . Encyclopedia.com. (August 17, 2018). http://www.encyclopedia.com/education/dictionaries-thesauruses-pictures-and-press-releases/prick-post
"prick-post." A Dictionary of Architecture and Landscape Architecture. . Retrieved August 17, 2018 from Encyclopedia.com: http://www.encyclopedia.com/education/dictionaries-thesauruses-pictures-and-press-releases/prick-post