Mayan Symbol
It sounds like you are describing the Mayan symbol for 13 (3 dots over 2 lines). Here in california, we have been using as a point of validation for Surenos.
This symbol is from the Mayan numerical system. This symbol translates to the number 13. The number 13 corresponds to the thirteenth letter of the alphabet, which is the letter M. M in the Spanish language is pronounced and written EME. Southern Hispanic or Sureno inmates who associate themselves with the Mexican Mafia (EME) Prison Gang utilize this symbol to show their allegiance and loyalty to the EME. Based on my experience, only Southern Hispanics in good standing with the Mexican Mafia are allowed to utilize this symbol.
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