The item ID for Dragon Scales in Skyrim on Steam (PC / Mac) is:
To spawn this item in-game, open the console and type the following command:
player.AddItem 0003ADA3 1
To place this item in-front of your character, use the following console command:
As the name would suggest, Dragon Scales are scales from a dragon (i.e. their skin). They are used in a variety of crafting recipes such as those to make dragonplate and dragonscale armor. You can obtain dragon scales by killing dragons and looting their remains, you can also collect a dragon scale (that respawns once every 7 days) near the Shrine to Akatosh (Rorikstead).