The at sign, @ - known by more creative names in European foreign languages as the "snail", the "little monkey tail", and the "spider monkey", has many alternative creation theories, including that it developed as an a inside an e, short for "each at", that it was created in the Italian Renaissance by Francesco Lapi, and that it appears in a Norman French painting, as accountancy shorthand, as the word "à".
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No one invented the minus sign or at least none that we know of, it is simply part of the evolution of mathmatics. The minus sign we use appeared in the 1400s
Obviously it was not invented. It was always just there.
it was invented in 1976 by sir Morgan Harvey
It was invented, not discovered.
The guy who invented the addition sign