1. Ara definition, the Altar, a southern constellation between Triangulum Australe and Scorpius

2. The disk of Triangulum has an estimated mass of (3–6) × 109 solar masses, while the gas component is about 3.2 × 109 solar masses.

3. Ara (Latin: "the Altar"), the southern constellation between Scorpius, Telescopium, Triangulum Australe and Norma, was (as Βωμός (Bōmǒs)) one of the Greek bulk (namely 48) described by the 2nd-century astronomer Ptolemy, and it remains one of the 88 modern constellations defined by the International Astronomical Union.

4. Atrium (heart) (plural: Atria), an anatomical structure of the heart Atrium (architecture) (plural: Atria), a large open space within a building Atria gens, an ancient Roman family; Atria (star) or Alpha Trianguli Australis, a star in the constellation Triangulum Australe Atria Institute on gender equality and women's history; Atria Senior Living, an American assisted