# Miscellaneous Symbols

Written by Jerry Ratzlaff on . Posted in Nomenclature & Symbols for Engineering, Mathematics, and Science

## Miscellaneous Symbols

This is a list of the most common miscellaneous symbols:

SymbolDefinitionExample
$$a^n$$ power, an exponent $$5^4 = 3125$$
% percent, $$1$$% $$= 1/100$$ $$5$$% $$\times 4 = 0.2$$
$$\Phi$$ golden ratio $$1 : 1.6180339887...$$
$$\pi$$ Pi $$\pi = 3.141592654...$$
$$e$$ Euler's number constant $$e = 2.718281828...$$
$$\gamma$$ Euler-Mascheroni constant $$\gamma = 0.5772156649...$$
$$x!$$ fractional $$5!=5\;x\;4\;x\;3\;x\;2\;x\;1=120$$
$$\sum$$ sigma, summation or sum of all $$\sum_{n=4}^8 n = 4+5+6+7+8=30$$
$$\exists$$ there exists
$$\nexists$$ there does not exists
$$\forall$$ for all
$$\infty$$ infinity
$$\propto$$ porportional to $$\frac{1}{4} \propto \frac{2}{8}$$
$$i$$ imaginary number $$i=\sqrt{-1}$$