Func climbable pole
From Valve Developer Community
Func_climbable_pole is a brush entity in hunt down the freeman. It is used with the game's parkour mechanic. When player jumps on this "pole" without weapons. Player is available to climb it up or slide it down.
Bug: Taking hold of the pole without jumping into it first, makes player unable to move. Prone to get unstuck.
Bug: This brush entity can crash hammer easily and is recommended to make multiple saves between placing these.