triangulum : Idioms & Phrases
lampropeltis triangulum
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noun nonvenomous tan and brown king snake with an arrow-shaped occipital spot; southeastern ones have red stripes like coral snakes
milk adder; checkered adder; house snake; milk snake.
WordNet
triangulum australe
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noun a small bright constellation in the polar region of the southern hemisphere near Circinus and Apus
Southern Triangle.