symbol-name

    Specifies a symbol consisting of 1 to 255 alphanumeric
    characters.

 prompt-string

    Specifies the prompt to be displayed at the terminal when the
    INQUIRE command is executed. String values are automatically
    converted to uppercase. Also, any leading and trailing spaces and
    tabs are removed, and multiple spaces and tabs between characters
    are compressed to a single space.

    Enclose the prompt in quotation marks (" ")  if it contains
    lowercase characters, punctuation, multiple blanks or tabs, or
    an at sign (@). To denote an actual quotation mark in a prompt-
    string, enclose the entire string in quotation marks and use
    quotation marks (" ")  within the string.

    When the system displays the prompt string at the terminal,
    it generally places a colon (:)  and a space at the end of the
    string. (See the /PUNCTUATION qualifier.)

    If you do not specify a prompt string, the command interpreter
    uses the symbol name to prompt for a value.