Identifiers are names of Variabls, Objects, Labels, Subroutines or Constants and must meet these requirements:
The first letter must be a character
Minimum lenght is 1 character
It may be made up of characters, numbers and the Undeline („_“.
Special characters and umlaut except the underline are not permitted
Examples of legal Identifiers:
a
Horst
MySubRoutine
hello123
m1_var