| Oracle® Database PL/SQL Language Reference 11g Release 2 (11.2) E25519-07 | 
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An exception declaration declares the name of a user-defined exception. You can use the EXCEPTION_INIT pragma to assign this name to an internally defined exception.

Name of the exception that you are declaring.
You can use exception only in an EXCEPTION_INIT pragma, RAISE statement, RAISE_APPLICATION_ERROR invocation, or exception handler.
Caution:
Oracle recommends against using a predefined exception name forexception. For details, see "Redeclared Predefined Exceptions". For a list of predefined exception names, see Table 11-3.