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Symbol

Unique identifier for variable.  It is used in equations to represent the variable.  It can be any combination of letters, the digits 0-9 and underscores so long as the first character is not a digit.  It can be of any length but is best limited to 1-4 characters.  Examples of valid symbols are:
A
A1 
_1
Res_1
Examples if illegal symbols are:
A B (No embedded blanks allowed)
A$1 (Illegal character) 
1_ (Digit not allowed as first character)