When delimiter_spec is included in a control file entry, it may use the following syntax:

{TERMINATED [BY] {WHITESPACE | 'string' | X'hexstring'}
   | ENCLOSED [BY] {WHITESPACE | 'string' | X'hexstring'}
   | TERMINATED [BY] {WHITESPACE | 'string' | X'hexstring'} [OPTIONALLY]
[ENCLOSED [BY]   {WHITESPACE | 'string' | X'hexstring'}]}

The Oracle Server Utility User’s Guide contains a full syntax description.