A-Z Database
The letter x has several meanings besides being the 24th letter of the alphabet. On its own and usually as a capital letter, X is the letter of the Gr...
This expression defines the location of something, usually on a map or diagram. It was used by Robert Louis Stevenson in Treasure Island (1883) where...
X-rays are a form of electromagnetic radiation first discovered by the German physicist Wilhelm Conrad Röntgen in 1895. He called them X rays after th...
Never mind the TV talent show that borrowed the term in the early 21st century, and defined the x-factor as that special quality that leads to stardom...
see X
see X