The acronym "YAML" originally stood for "Yet Another Markup Language". However, it was later changed to the recursive acronym "YAML Ain't Markup Language". This change emphasizes that YAML is primarily a data serialization language, designed for human readability and data exchange, rather than a document markup language like XML.
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UrbanDictionary is redefining "YAML" as the backronym read:
SMS shorthand for "Yeah, I Am Making Love", which is derived from the abbreviation ML (Making Love).