For example, in Overgear#1337 “Overgear” is a BattleTag, and “1337” is a unique digital number that the website randomly generates upon your registration.
Creating your account, Blizzard will ask you to come up with your BattleTag. The BattleTag is a virtual name that exists within Blizzard games to hide your real name from others. For example, in Overgear#1337 “Overgear” is a BattleTag, and “1337” is a unique digital number that the website randomly generates upon your registration.