Alternative form of ROT13

(physics) the less common of the two stable isotopes of carbon, ¹³₆C, having six protons and seven neutrons

(physics) A radioactive isotope of nitrogen, ¹³₇N, having seven protons and six neutrons, and a half-life of less than ten minutes; it is used in positron emission tomography

(organized crime) Mara Salvatrucha, a criminal gang operating in some Salvadoran communities in Central and North America.

Alternative form of sweet thirteen

(US, military slang, dated) A trash can, wastepaper basket.

suitable for adolescents, typically due to the absence of explicit sexuality and intense graphic violence

Alternative spelling of grade thirteen

plural of sweet 13

(Internet slang, leetspeak) Alternative form of elite / (Internet slang, leetspeak) Alternative spelling of leet