Googling Scheme Lisp shows an image of Lambda.
Lambda is used as the symbol of gay/lesbian "rights".1
Need we say more?
Was it hard to understand me, due to my LITHP?
The term “Zetalisp” was coined at a meeting in which we systematically eliminated every single other Greek letter. The obvious choice, “lambda”, later taken by LMI, was rejected on the grounds that the letter lambda was then being used as an emblem for the gay rights movement. https://smbx.org/allan-c-wechsler-symbolics-several-memories/↩