The Analytic Expression of a Function Like the English Letter W in the Image of a Function

F (x)=[(x+1)^2][(x-1)^2]

Why is the profit function expressed in L? The profit function is denoted by L (x). Is L an abbreviation of any English word?

Lucrative
English:['lu: kr tiv]
Tone:['lukr t v]
The adjective a.
Profitable

Lucuative
Ying Yin:
Music:['lukr t v]
The adjective a.
It's profitable.

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