A distinct type of punching strike which is physically distinguishable by striking in a pushing, circular, forward direction - making contact with the front of the first two knuckles of the fist, palm pointing outward.

Comments:

This strike is most typically effected on a relatively horizontal circle, but may be executed on a slight upward or downward slope, depending upon need.

By definition, this strike either uses a Thrusting (or Snapping) Method of Execution.

The contact of this strike is made before the apex of the circle - thus, the pushing nature of the strike.

The word vertical, in this case, refers to the orientation of the fist being vertically oriented in relation to its horizontally oriented counterpart - the straight punch.

The word inverted, in this case, refers to the orientation of the fist such that the palm faces outward and therefore being the inverted version to its cousin the roundhouse punch.

This is essentially the circular version of and inverted vertical punch (which not part of the standard curriculum and is only executed within the self-defense techniques).