Omega (TeX)

Omega (𝞪) is a special symbol that looks like a wavy line. It's often used in math to mean "the end" or "the last". For example, if you have a list of things you have to do, and then at the end you write "omega", it means "I'm done with this list". It's also used to mean "all". So, if someone asked you "what are all the colors of the rainbow?", you could answer "red, orange, yellow, green, blue, indigo, violet, omega". That's all the colors of the rainbow!