What is the meaning of Hockey_stick?

A stick used to handle the puck in ice hockey, having a flat, angled blade at the end.

A stick used to handle the ball in field hockey, having a flat-faced hook at the end.

A playing card with the rank of seven.

A statistical trend in a graph of survey data in which most of the results are flat and then the graph suddenly peaks in a steep near-vertical direction.

Source: wiktionary.org