Conventional letters to use for errors

Question

I have already defined a group of errors of different types: $\omega_a, \omega_b, \ldots, \omega_z$

As well as another group of errors of various types: $\Omega_A, \Omega_B, \ldots, \Omega_Z$.

Now I am looking for symbols or letters to represent any error of the two groups. There are two ways I could think of

1) "let $\omega$ denote any error of the first group without specifying the error type" and "let $\Omega$ denote any error of the second group without specifying the error type"...

2) let $\omega = \{\omega_a, \omega_b, \ldots, \omega_z\}$ and $\Omega = \{\Omega_a, \Omega_b, \ldots, \Omega_z\}$, but in this case, I do not know which letters to use to represent an error without saying its type.

Could anyone tell me which way is better? Thank you.

Answer 1

You may use the following: "If we wish to leave the type of an error of the first (respectively second) group unspecified, we denote the error by $\omega$ (respectively $\Omega$)''.