Omega (TeX)
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Omega is an extension of the TeX typesetting system that uses Unicode. It was authored by John Plaice and Yannis Haralambous after TeX development was frozen in 1991, primarily to enhance TeX's multilingual typesetting abilities. It includes a new 16-bit font encoding for TeX, as well as fonts (omlgc and omah) covering a wide range of alphabets.
Omega for LaTeX is invoked as lambda.