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

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

(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.

plural of sweet 13

Alternative spelling of grade thirteen

A radioactive isotope of caesium, ¹³⁷₅₅Cr, having 55 protons and 82 neutrons and which is formed mainly as a fission product by nuclear fission.