"Tachyon Dragon" (時空竜（タキオン・ドラゴン） Takion Doragon) is an archetype of high-Rank LIGHT Dragon monsters, which are used by Mizar in Yu-Gi-Oh! ZEXAL. It is a sub-archetype of the "Tachyon" archetype. A tachyon or tachyonic particle is a hypothetical particle that always moves faster than light, and most physicists believe they cannot exist because they are not consistent with the natural laws of physics. The word comes from the Greek word tachys, meaning "swift, quick, fast, rapid". This is a reference to the rivalry between Mizar's "Number 107: Galaxy-Eyes Tachyon Dragon" and Kite Tenjo's "Galaxy-Eyes Photon Dragon".