The point that stands backward in an arrow, fishhook, etc., to prevent it from being easily extracted. Hence: Anything which stands out with a sharp point obliquely or crosswise to something else.
User Defined Definitions
"an aggressive remark directed at a person like a missile and intended to have a telling effect"
"the pointed part of barbed wire"
"a subsidiary point facing opposite from the main point that makes an arrowhead or spear hard to remove"
"one of the parallel filaments projecting from the main shaft of a feather"