In chemistry classes or even many different branches of chemistry textbooks, I am told that the atomic symbol
includes the following notations:
- $A$ – "atomic mass" or "mass number";
- $Z$ – "atomic number".
But, because I want to make myself to remember easily, I would prefer to call $A$ "Atomic mass number" instead of simply "mass number". I think many say that I am making a big deal and unnecessary things. But as a non-native learner, if I can confirm that using the term "atomic mass number", it would make me easier to remember the term.