aum / ohm / om [oʊm]
aum – n. – an old Dutch and German unit of liquid capacity varying from 36 to 42 gallons
ohm – n. – Electricity, a unit used to measure resistance or conductivity – directly related to voltage (volts) and inversely related to current (amperes)
om – n. – Hinduism and Buddhism, a mystic syllable used as a mantra and the beginning and end of prayers