nb: Robert Recorde also came up with the equals sign as two horizontal parallel lines "=". Yes, that one.

"bicause noe 2, thynges, can be moare equalle"

(and helped make + and - signs more popular)

https://en.wikipedia.org/wiki/Robert_Recorde

see page 5:

https://sigapl.org/Articles/Language%20as%20an%20intellectua...

obligatory mention of Notation as a Tool of Thought

1979 Turing Award lecture by Ken Iverson

https://www.eecg.utoronto.ca/~jzhu/csc326/readings/iverson.p...