OD

OD is a two-letter abbreviation and can mean any of the following:

Order of Distinction, a civil honour of Jamaica
Object Desktop, a suite of skinning and customization programs by Stardock, or ObjectDock, another program by the same company
Oblivion Dust, a Japanese rock band
On Demand, when it is available on demand
Officer of the day
Old Dragon, former pupil of the Dragon School
Old Derbeian, a former pupil of Derby School
Olive Drab, as in OD Green
Oneness Darkness, a Texas rock band
OpenDocument, the only ISO acknowledged standard document file format
One Day Match, a type of shorter match in cricket
Optical density
Ordnance Datum, a vertical datum used in Great Britain as the basis for deriving altitudes on maps.
Doctor of Optometry (O.D.)
Organization development
Orphei Drängar, a Swedish male choir
"Ocular dextra," medical terminology meaning "right eye" ("ocular sinistra" is the term for the left eye). Abbreviated O.D. and O.S. and commonly used in ophthalmology and optometry.
Outside diameter, a dimension commonly used to specify the size of tubing or pipe
Od language, a language based in Pakistan.
Overdose, related to Drugs
OverDrive CPUs
Odessa, TX, a small city in West Texas
On Duty, mostly used in colleges and schools in the attendance sheets to indicate the time the student spent on other extracurricular activities (Cultural Programs etc.)
Original dance, the second part of an ice dancing competition
Octavian Droobers, an orienteering club.
Oringin Destination fare, used for calculating airfares
O.D. (musician) a founding member of the Finnish industrial band Velcra
Official Dress in the popular agriculture club: National FFA Organization

Non abbreviated meanings of OD are as follows:

For the Norse god Od, see Óðr
For the life force Od, see Odic force
For the Unix program od, see od (Unix)
Od, a replacement for "God" in some minced oaths