Is there a symbols chart or legend for common aerospace equations? I've read a lot of answers on this site that make references to various aerospace equations.

So many of these are awesome responses, but I have trouble understanding the math because I don't know what all the symbols in the equation mean, or what units they are referring to.

For example, this question uses the equation below and even has a really cool picture to go along with it:



However when trying to understand the "mass flow" function I didn't see any explanation of what the lowercase "t" variable was.

I am sure this is common knowledge for many people, but are there are any charts out there for amateurs like myself to understand the different symbols commonly used in fluid functions and their implied units?

Or is this really a matter of needing to learn aerospace in general as the equations are too diverse to understand by a symbols cheat sheet?
Unfortunately, the nomenclature used can vary from source to source, and the same variables can even be used for completely different things depending on the context. It is generally good practice for the author to describe the variables they use, but we've all been guilty of skipping that step.

In any case, there are many helpful sites such as See How It Flies or the Aerodynamics Index from NASA that tend to use pretty 'standard' notation. BUT, there is no single cheat sheet that has every variable for every analysis and one should always be careful to double check.