Do you ever come across a Greek symbol in your reading and think, “now what does that stand for again?”  Professors and other experts at the University of Nottingham have made a series of YouTube videos that will (hopefully) jog your memory.

SixtySymbols is now archived on YouTube only.

Here’s ∞ (infinity) for your any level of math class after the first discussion of interval notation.

And j (for imaginary numbers, which is i in many U.S. math texts).

Or how about ω (angular velocity) for that Trig class you’re teaching?