Give one word or a phrase for the following.
The gas used in advertisement signs
The gas used in advertising signs is Neon.
Neon is a noble gas that glows and gives a reddish-orange glow when an electric current is passed through it.
Noble gases - The group of gaseous non-metals that do not react under general conditions and are found in an independent atomic state.
For example - Helium, Neon, Argon, and Xenon.