This symbol will appear in many formulas. Today, let's learn about this symbol.
As a Greek lowercase letter, the bend in the upper left corner is φ of the opening; When used as a symbol, you usually write? .
Symbol type:
Quantitative symbol.
For example, pi (π, 3. 14 159265358979), natural rate (e, 2.7 1828), Fibonacci golden section (φ, 0.6 18033), imaginary number (.
Operation symbol.
Such as plus sign (+), minus sign (-), multiplication sign (× or), division sign (÷ or/), union of two sets (∩), intersection (∩), root sign (∩ ~), logarithm (log, lg, ln,