noun

• (physics, astronomy) A unit of brightness (of the sky at night) equal to 10¹⁰/4π quanta per square meter per second per steradian
• A surname.
• Lord Rayleigh, English physicist
• A town and civil parish with a town council in Rochford district, Essex, England (OS grid ref TQ8090).
• A neighbourhood of Kamloops, British Columbia, Canada, named after the English town.