A triangle is the symbol used to indicate a fulcrum in a lever, a triangle has three sides and three vertices.
A fulcrum is a pivot that has a base and a point that serves as a balance for a lever.
Basically a lever is a simple machine that is a beam with two sides pivoted to fulcrum.
A lever has Load, Effort and the last part is fulcrum
Learn more about fulcrum here:
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