O & T
Operations and Training [Military]
Organization and Training [Military]
Oyer and Terminer [Hear and Determine] [Legal term] (DLA)
O/T
On Thames [In place names] [British] (ROG)
On Trent [In place names] [British] (ROG)
Oral Temperature (DAVI)
Other Times (PIPO)
Overtemperature (KSC)
o/t
Other Times (PIAV)
o-T
on-Thames (SAUS)
O-T
Orthohombic-Tetragonal [Temperature transition]