A1 is popularly used to indicate the highest degree of excellence. Other possible meanings include:

A1 (band), a British boy band.

A1 (code), used in computer programming.

A1 (primary auditory cortex), the part of the brain processing hearing.

A1 (sauce), a steak sauce.

A1 (shipping), used to indicating shipbuilding quality.

A1 is an ISO 216 paper size.

There are also several roads and freeways named the A1:

A1 freeway (Austria)

A1 road (Britain) from London to Edinburgh

A1 freeway (Cyprus)

A1 freeway (France) from Paris the Belgian border

A1 freeway (Germany)

A1 road (Italy) from Milan to Naples

A1 road (Northern Ireland) from Belfast to Newry

A1 freeway (Poland)

A1 freeway (Spain)

A1 (Switzerland)

This is a disambiguation page; that is, one that points to other pages that might otherwise have the same name. If you followed a link here, you might want to go back and fix that link to point to the appropriate specific page.