There are many:
pi (or π);
f or h for frequency (h is for Hertz, the unit for freq);
l for the wavelength (lambda = l for length);
t for time.
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The symbol for representing the period of a wave is the greek letter lambda (λ).
What mathematical symbol? Different symbols were invented in different times and places.
"why" is not a mathematical symbol.
It's a mathematical metaphor.
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