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A3, a paper size defined by ISO 216

A3 is a game(MMORPG), which is one of the most active game with almost 4 million people playing all around the world

A3, a musical note, the A below Middle C

A3: Awakening, an online game

A3, a German rocket design during World War II

Alabama 3, as the United States alias of the London band

Aegean Airways IATA code

Art, Alive and Attraction, a Korean MMORPG

Audi A3, a brand of automobile

Bundesautobahn 3 (Germany), an autobahn connecting Wesel to Passau

HMS ''A3'', a British A class submarine of the Royal Navy

USS ''Grampus'' (SS-4), a Plunger class submarine of the United States Navy

In town and country planning in the UK, A3 is the code for permission to use specific land or premises for restaurants and cafés.

LNER Class A1/A3 a Pacific Locomotive Designed by Sir Nigel Gresley including the famous No 4472 Flying Scotsman

The A3 Air Operations Branch of the UK Joint Force Air Component Hedquaters

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A-3
The variant A-3 can refer to:

A-3 Skywarrior, a strategic bomber manufactured by Douglas Aircraft Company
Abrial A-3 Oricou, a French touring aircraft designed in 1927
Alpha Trion, as the former name of this character from the Transformers Series
ARITH-MATIC, as the former name for this programming language

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A3 Roads
There are several roads and highways with the designation A3:

A3 (Switzerland), a motorway connecting Basel to Sargens
A3 road (England), a trunk road connecting London to Portsmouth
A3 highway (Cyprus), connecting Larnaca and Ayia Napa
A3 highway (Portugal), connecting Porto to Braga
A3 freeway (Romania), a freeway, currently in construction, linking Transylvania to Bucharest
A3 Motorway (Italy), connecting Naples to Reggio Calabria
Autovía A-3, a Spanish autovía connecting Madrid to Valencia.