Yes. We are talking about the same thing, only you are unfamiliar with the Spanish. The Mexican Mafia refer to themselves as “La Eme.” That is their initial, in Spanish They are in prisons all over the West.
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Not that “unfamaliar” with La Familia “La Eme”. I believe their sign is both hands about mid-chest with the last three digits pointing down, on each hand, and both hands almost touching at base of the thumbs. I am no gang expert by any means, but I have been at the park near our house and have observed a few different fellows meet and greet each other.