Definition:Congruence (Geometry)/Historical Note
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Historical Note on Congruence
The symbol introduced by Gottfried Wilhelm von Leibniz to denote geometric congruence was $\simeq$.
This is still in use and can still be seen, but is not universal.
Also in current use is $\cong$.
Sources
- 1992: George F. Simmons: Calculus Gems ... (previous) ... (next): Chapter $\text {A}.19$: Leibniz ($\text {1646}$ – $\text {1716}$)