Neon Sign - A flowerier lighting for night

In usual life, we can see many neon sign hanged on wall and bar with flowerier light. We are a newbie of neon sign industry. Is there anyone could explain the exact definition of neon sign, and conclude the classifeld.

I just know open neon sign, neon poster, neon light.

Yesterday, I found some websites related to neon sign:

http://www.neonshop.com
http://www.signweb.com
http://www.signindustry.com
http://www.pop-sign-display.com
http://www.neon-signs.com
http://www.neon-nites.com

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