ne ‧ on /ˈniːɒn $ -ɑːn/ BrE AmE noun [uncountable]
[ Date: 1800-1900 ; Language: Greek ; Origin: neos 'new' ]
a colourless gas that is found in small quantities in the air and is used in glass tubes to produce a bright light in electric advertising signs. It is a chemical ↑ element : symbol Ne
neon lights/signs (=ones that use neon)
the neon lights of Las Vegas
A neon sign flashed on and off above the door.