Device for Creating Luminous Display Signs
Puzzle 3 of Shiny Things Piece of Cake Pack
Question is: Device for Creating Luminous Display Signs
and the answer is: NEONTUBE
Word Meaning:
NEON — (uncountable) The chemical element (symbol Ne) with an atomic number of 10. The second of the noble gases, it is a colourless, odorless inert gas.
Definitions from Wiktionary.