Mycenaean Linear B tablet Ashmolean An1938_708_o with the single supersyllabogram O on it:

AN1938_708_o KN 1301 E j 324

Mycenaean Linear B tablet Ashmolean An1938_708_o has the single supersyllabogram O on it. This supersyllabogram O stands for onato = a lease field, as the translation makes perfectly clear.