It was introduced by the Welsh mathematician William Jones in 1706
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Any mathematician will use the number pi (and its symbol) sooner or later - it is a number used extensively in many different areas of mathematics.
To my knowledge, there is no symbol used for quotients in mathematics.
The symbol with a "Z" in a circle is known as the "Z" symbol, which has been associated with the Russian military, particularly in the context of the Ukraine conflict. It has been used as a pro-war emblem and is often seen on vehicles, uniforms, and propaganda materials. The symbol has gained widespread recognition and controversy, representing support for the military actions taken by Russia.
The symbol used for a negative is a minus Sign
"why" is not a mathematical symbol.