It's an alternative coin to bitcoin. Most alts are basically almost the same as bitcoin, but have a different name and logo and different total numbers of coins. Nascoin is not based on bitcoin, but on Nxt, which has a completely different code base to bitcoin. Nascoin's dev disappeared and the coin has crashed heavily in value since, leaving a lot of angry investors who feel they have been ripped off. It might be a good idea to choose a new name for your asset.
For example I see many different poker related coins or sites, but never one proposed by the players for the players, in order to link the entire industry together.
http://thewealthofchips.wordpress.com/2014/11/11/what-is-ideal-poker-what-is-asymptotically-ideal-poker/
Yes, but the original Nascoin uses the ticker NAS on exchanges. If your coin also uses NAS it will confuse people, they will not know which coin it refers to.