What does AO stand for?

Adjustable Objective (rifle telescopic sight)

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

Other Resources:

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ACCS (Army Command and Control System) OSI (Operator System Interface) Acousto Optics Acquisition Objective Acridine Orange Acronym Overload Action Officer Action Oriented Active Optical Adaptive Onestep (IEEE) Adaptive Optics		Administration Officer Administrative Office/ Officer Administrative Order Admit One Adults Only Adults Only (ESRB game rating, 18 yrs. and up; graphic sex/violence) Advanced Organization (Church of Scientology) Advisory Opinion Aerial Observer Aeronautical Orders (orders authorizing a military person to perform duties in flight)

Samples in periodicals archive:

A popular option for precision shooting is the adjustable objective lens.

Choosing a Rifle Scope

Pocket Microscope: This kind of microscope consists of a single shaft with an eye piece at one end and an adjustable objective lens at the other.

Different Types of Microscopes

This particular model is available with an adjustable objective in 6x24x40.

Bushnell Scopes - Performance without the Hype

Engineered with an adjustable objective lens for parallax correction and easy-grip target turrets, Excavator features multi-coated optics and 1-inch monotube construction.

Barska: Excavator scopes

This 3 to 15 power scope features an adjustable objective with 1/4 minute target knobs.

12 new ways to profit

The BSA Models AR 3-12x44 and AR 2-7x32 have adjustable objectives that focus down to 10 yards and feature target-style turrets with finger-adjustable 1/4 MOA clicks for windage and elevation.

AIRGUNS -- NOT JUST FOR KIDS!

The two higher-range scopes have adjustable objective lenses for precision shooting at any range.

Simmons Expedition Scopes

5x20 Adjustable Objective, and the VARI-X 3x9 Compact EFR Adjustable Objective.

A closer look at scopes: dispelling the optical confusion