History Large rattleback made from different wood densities Archeologists who investigated ancient Celtic and Egyptian sites in the 19th century found celts which exhibited the spin-reversal motion. The antiquarian word celt (the "c" is  pronounced as "s") describes adze-, axe-, chisel- and hoe-shaped lithic tools and weapons  .
History Large rattleback made from different wood densities Archeologists who investigated ancient Celtic and Egyptian sites in the 19th century found celts which exhibited the spin-reversal motion. The antiquarian word celt (the "c" is soft, pronounced as "s") describes lithic tools and weapons shaped like an adze, axe, chisel, or hoe .
A
soft,
D
adze-, axe-, chisel- and hoe-shaped
A
shaped like an adze, axe, chisel, or hoe