This number can be found alone or in conjunction with other symbols.
There are three different definitions to what it means, the most common being associated with drugs and narcotics. The letter M, being the 13th letter of the alphabet, often is said to stand for marijuana or motorcycle. Generally, it is assumed someone wearing a 13 patch is either a user of marijuana or other drugs, or is involved with the sale of them. The M also has been known to stand for "methamphetamine".
The third definition of a 13 patch is that the wearer is his own judge & jury - this is due to 13 standing for 12 jurors and the additional number being the judge.
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