Theorema is a genus of butterflies.
Theorema is also Latin for "theorem", and a number of theorems are sometimes referred to by a Latin name in English, most notably two theorems of Carl Friedrich Gauss: Theorema Egregium, "Remarkable Theorem", best-known example Aureum Theorema, "Golden Theorem", better-known as quadratic reciprocity
See also
Teorema (disambiguation) Theory (disambiguation) Theorem