they are called IDs, and most of the time a persons ID will change every now and then, as it is connected to your router/ip in some way, but sometimes people can have static IDs, as for around two years i had a static green one, but our router had to be changed and so i lost it 😔

Description: John sprite sheet version 2 Drawn by Scott. (Non-john sprites on this sprite sheet probably made by John) predicted edits made by John (allegedly)