What the squiggly line (tilde ~) means in math, statistics, Unix paths and Spanish, and how to type it on Windows, Mac, iPhone, HTML, Word and LaTeX.
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What the diameter symbol ⌀ means, how it differs from Ø, ∅, and phi, and how to type it on Windows, Mac, iPhone, Word, Google Docs, Excel, HTML, and LaTeX.
What the trademark ™, registered ® and copyright © symbols mean, when each applies, and how to type them on Windows, Mac, phones, Word, HTML and LaTeX.
What ≥ and ≤ mean, how to type them on Windows (Alt 242/243), Mac, phones, Excel and HTML, and the LaTeX commands \geq, \leq, \geqslant and \ngeq.
How to type the euro sign € and pound sign £ on Windows (Alt 0128/0163), Mac, phones, Excel and HTML, where each sign came from, and the LaTeX commands.
What the xi symbol means and how to pronounce it: random variables, correlation length, the Riemann xi function. How to type ξ and Ξ on Mac, Windows, LaTeX.
What the rho symbol means in physics, math, and statistics: density, resistivity, correlation, polar coordinates. How to type ρ on Mac, Windows, LaTeX.
What the psi symbol means: the quantum wave function, psychology's emblem, the digamma function. How to type ψ and Ψ on Mac, Windows, and in LaTeX.
What the nu symbol means: frequency in E = hν, neutrinos, kinematic viscosity, Poisson's ratio, degrees of freedom. How to type ν on Mac, Windows, LaTeX.
What the eta symbol means: efficiency, viscosity, the learning rate, the Dirichlet eta function, the metric tensor. How to type η on Mac, Windows, LaTeX.
What the chi symbol means: the chi-squared test, susceptibility, Euler characteristic, Chi-Rho. How to type χ and Χ on Mac, Windows, and in LaTeX.
How to type the squared symbol ², cubed ³, and every superscript number on Windows, Mac, iPhone, Android, Word, Google Docs, Excel, HTML, and LaTeX.