If true, an attempt is made to print an expression in such a way that it can be read again to produce an equal expression. (This is only a guideline; not a requirement. See *print-readably*.)
For more specific details of how the value of *print-escape* affects the printing of certain types, see Section 22.1.3 Default Print-Object Methods.
(let ((*print-escape* t)) (write #\a)) #\a #\a (let ((*print-escape* nil)) (write #\a)) a #\a