Meaning of SGML in English

SGML /ˌes dʒiː em ˈel/ BrE AmE noun [uncountable] technical

(standard generalized markup language) a way of writing a document on a computer so that its structure is clear, and so that it can easily be read on a different computer system

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.