"A Tour of Standard Meta-Language" is nonsense. If there's one really unfortunate thing about ML, it's that the expanded (original? source?) name of the language is so meaningless that nobody bothers to learn it. The name of the language really is ML, not something that ML happens to stand for. Though as others have said, the same is true of BASIC and COBOL.
"A Tour of SML" is still an abbreviation, is less clear for anyone who knows what Standard ML is, and is not the original title.
The first two hits that come up when I type ML into the algolia HN search (https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...) are
"ML From Scratch, Part 1: Linear Regression" (301 points), which is about machine learning
and
"ML for the Working Programmer, 2nd Edition" (266 points), which is about ML
Which is the more ambiguous? Noting that the second one is about a thing whose name is ML, while the first is about a thing that is sometimes casually abbreviated to ML.