What does AAT stand for?

atypical antibody test

Activity As Tolerated

Animal-Assisted Therapy

Activities As Tolerated

Androgen Ablation Therapy

Anglo-Australian Telescope

The Anglo-Australian Telescope is a 3.9 m equatorially mounted telescope operated by the Australian Astronomical Observatory and situated at the Siding Spring Observatory, Australia at an altitude of a little over 1100 m. In 2009, the telescope was ranked as the fifth highest-impact of the world's optical telescopes. In 2001–2003, it was considered the most scientifically productive 4 metre-class optical telescope in the world based on scientific publications using data from the telescope.

Alpha1-AntiTrypsin

Atomic Axial Tensor (in Mol. Optical Properties Calcns.)