O7 may refer to: * O7 star, a subclass of

O-type star An O-type star is a hot, blue star of spectral type O in the Yerkes classification system employed by astronomers. They have surface temperatures in excess of 30,000 kelvins (K). Stars of this type have strong absorption lines of ionised h ...

s **

Shell star A shell star is a star having a spectrum that shows extremely broad absorption lines, plus some very narrow absorption lines. They typically also show some emission lines, usually from the Balmer series but occasionally of other lines. The broad ...

LNER Class O7 O7 may refer to: * O7 star, a subclass of O-type stars ** Shell star * LNER Class O7, a class of British steam locomotives * OzJet (IATA airline code ), Australian airline * o7, an emoticon for a person saluting * O-7, a pay grade in the US u ...

, a class of British steam locomotives *

OzJet Ozjet Airlines Pty Ltd was a airline, scheduled and air charter, charter airline with its head office in Tullamarine, Melbourne, Australia operating within Australasia from Melbourne Airport, Sydney Airport and Perth Airport. In 2008 the airlin ...

(IATA airline code ), Australian airline * o7, an

emoticon An emoticon (, , rarely , ), short for emotion icon, is a pictorial representation of a facial expression using Character (symbol), characters—usually punctuation marks, numbers and Alphabet, letters—to express a person's feelings, mood ...

for a person saluting * O-7, a pay grade in the US uniformed services: ** Brigadier General in the Army, Marine Corps, Air Force, and Space Force **

Rear admiral (lower half) A rear admiral in four of the uniformed services of the United States is one of two distinct ranks of commissioned officers; "rear admiral (lower half)," a one-star flag officer, and "rear admiral" (sometimes referred to as "rear admiral (upper ha ...

in the Navy, Coast Guard, Public Health Service Commissioned Corps, and NOAA Commissioned Officer Corps

See also