Scalar values refer to scaling.

According to a citation in the Oxford English Dictionary the first recorded
usage of the term "scalar" in English came with W. R. Hamilton in 1846,
referring to the real part of a quaternion:
"The algebraically real part may receive, according to the question in which it
occurs, all values contained on the one scale of progression of numbers from
negative to positive infinity; we shall call it therefore the scalar part."

Scala is the latin word for ladder, the English word scale comes from it
and scalar is derivative from scalaris which is an adjective form of scala.


From comments here:
https://www.youtube.com/watch?v=fNk_zzaMoSs&list=PLZHQObOWTQDPD3MizzM2xVFitgF8hE_ab




juicy tidbits:
https://github.com/3b1b

:O

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