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Kummer used $\lambda$ for a prime (he also used q), see here. I have no clue whether Weil introduced $\ell$ on his own or was following a previous tradition, but $\lambda$ is really close to $\ell$...

I don't know if Kummer introduced $\lambda$ or it was already in use by Jacobi, Dirichlet, or someone else. Does anybody know?

show/hide this revision's text 1

Kummer used $\lambda$ for a prime (he also used q). I have no clue whether Weil introduced $\ell$ on his own or was following a previous tradition, but $\lambda$ is really close to $\ell$...

I don't know if Kummer introduced $\lambda$ or it was already in use by Jacobi, Dirichlet, or someone else. Does anybody know?