Can you type ALT 0216 in MSAccess and get the Ø (uppercase phi) appearing correctly?
It may be to do with your windows locale, charactterset, msaccess characterset etc.
You say the "Oracle table shows the symbol correctly", what client tool are you using to select from said table?
What the the steps to mimic what you are actually doing so perhaps others could help investigate this?
Yes, when in type ALT 0216 in the MSAccess form it shows the symbol, but when I save the record it changes the symbol in the form to a question mark. My backend database is an Oracle database so I link the tables to MSAccess via an ODBC driver. The symbol shows correctly in the Oracle table, but it doesn’t translate correctly back to MSAccess.