The story
They became widely known after the publication of Charles Pisot's dissertation in 1938. Tirukkannapuram Vijayaraghavan continued their study in the 1940s.
Etymology from Wiktionary, CC BY-SA 4.0.
Pisot-Vijayaraghavan number
Today it means: A real algebraic integer greater than 1 all of whose Galois conjugates are less than 1 in absolute value. Full definition →