WHAT IS THE Greek letter equivalent to L?

There is no direct Greek letter equivalent to the Latin letter "L".

However, depending on the context, you might use:

* Lambda (Λ, λ): This letter is the closest in sound to "L" in some Greek words.

* Rho (Ρ, ρ): In some cases, "Ρ" can be pronounced as "R" which can sound similar to "L" depending on the dialect and word.

Ultimately, the best substitute would depend on the specific word or sound you are trying to represent.