An identifier is used to refer to a variable (see Variables). An
identifier consists of letters, digits, and underscores _, and must
contain at least one letter or underscore. An identifier is terminated
by the first character not in this class. Examples of valid identifiers
are
a foo aLongIdentifier hello Hello HELLO x100 100x _100 some_people_prefer_underscores_to_separate_words WePreferMixedCaseToSeparateWords
Note that case is significant, so the three identifiers in the second line are distinguished.
The backslash \ can be used to include other characters in identifiers;
a backslash followed by a character is equivalent to the character,
except that this escape sequence is considered to be an ordinary letter.
For example
G\(2\,5\)is an identifier, not a call to a function
G.
An identifier that starts with a backslash is never a keyword, so for
example \* and \mod are identifiers.
The length of identifiers is not limited, however only the first 1023
characters are significant. The escape sequence \newline is ignored,
making it possible to split long identifiers over multiple lines.
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GAP 4 manual