Where did the symbol ∝ for proportionality come from?

[YoungPhysicist]

If A is directly proportional to B, A ∝ B .If A is inversely proportional to B, A ∝ 1/B

But where did the symbol ∝ came from?

 

[jtbell]

A Google search for "proportionality symbol history" produced a link which indicated that a fellow named Emerson was the first to use it. A further search for "proportionality symbol emerson" produced the following link, which has references:

https://physics.stackexchange.com/q...oes-the-proportionality-symbol-originate-from

 

[YoungPhysicist]

Thanks! My problem completely solved!