The New York Stock Exchange started out as a coffee house.
tachyon (plural tachyons)
(particle) A hypothetical particle that travels faster than the speed of light.
(physics) A flaw in a physical theory that predicts the existence of tachyons or similar paradoxical results. Compare with ghost.
• tachyonic particle
Source: Wiktionary
2 April 2025
(adjective) secret or hidden; not openly practiced or engaged in or shown or avowed; “covert actions by the CIA”; “covert funding for the rebels”
The New York Stock Exchange started out as a coffee house.