'What is the difference between Unicode code points and Unicode scalars?

I see the two being used (seemingly) interchangeably in many cases - are they the same or different? This also seems to depend on whether the language is talking about UTF-8 (e.g. Rust) or UTF-16 (e.g. Java/Haskell). Is the code point/scalar distinction somehow dependent on the encoding scheme?

unicodeterminology


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