Once patients have been dealt with in A & E they often move to the AAU until a bed is free on the ward or while they need overnight observations. They can also be admitted directly to AAU from their GP. Doctors and surgeons from all departments see patients on AAU.
Found on http://www.encyclo.co.uk/visitor-contributions.php
Alpha Acid Units. A measurement of bitterness. AAU = hop AA% x Ounces added to the boil. This formula does not consider wort gravity, boil time and so on. Found on https://www.encyclo.co.uk/local/21582