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Symbol Names

Unless quoted, symbol names start with a letter, underscore, or point and may include any letters, underscores, digits, points, and hyphens. Unquoted symbol names must not conflict with any keywords. You can specify a symbol which contains odd characters or has the same name as a keyword, by surrounding the symbol name in double quotes, as in the following example’s input.

“SECTION” = 9;
“with a space” = “also with a space” + 10;

Since symbols can contain many non-alphabetic characters, it is safest to delimit symbols with spaces. For example, ‘A-B’ is one symbol, whereas ‘A -B’ is an expression involving subtraction.