Use "and" instead of &, unless part of a proper noun or a common abbreviation. For example: Notices and slips, not Notices & slips; Baker & Taylor, R&D.
display
Base terminology
Do not use in system preference options, use "show/don't show".
OPAC
Base terminology
Use "OPAC", not "Opac" or "opac" when abbreviating online public access catalog(ue), including in system preference names.