1. Mega-Extensive Telecommunications Applications Language. BBS language for PRODOS 8 on Apple II.

2. The syntax-definition formalism of the Mentor system. Metal specifications are compiled to specifications for a scanner/parser generator such as Lex/Yacc. "Metal: A Formalism to Specify Formalisms", G. Kahn et al, Sci Comp Prog 3:151-188 (1983).

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Meta-II « metainformation « Meta-IV « METAL » metalanguage » Metal Oxide Semiconductor » Metal Oxide Semiconductor Field Effect Transistor