Example of Wedge

Math: A triangular shape with the larger end being somewhat curved.
Verb: To attempt to squeeze yourself or an item into an opening that is barely large enough.

Examples of Wedges:

A pizza slice
A student who has had a growth spurt during summer break and has to now wedge into his school desk because he is it too tall.
https://wedge.anu.edu.au/
https://en.wikipedia.org/wiki/Wedge

Image Example of Wedge:

Triangular prism
(Parallel triangle wedge)

Rising wedge.

CGI image of 7 men in riot gear charging in flying wedge.