South Triangle
/ˌsaʊθ ˈtrʌɪaŋɡl/ /ˌsaʊθ ˈtrʌɪəŋɡl/Astronomy. Now historical and rare
noun
= Southern Triangle.
Origin
Late 16th century; earliest use found in Thomas Blundeville (fl. 1561), author and translator. From south + triangle, after post-classical Latin Triangulum australe.