symbol

    A symbol that is assigned a value equal to the number of
    characters in the specified character string.

 <string>

    A sequence of printable characters. Delimit the character
    string with angle brackets (<>)  (or a character preceded by a
    circumflex (^))  only if the specified character string contains
    a legal separator (comma, space, or tab) or a
    semicolon (;).