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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 examples 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.