: Because it is technically a letter, the system accepts it.
: In competitive gaming, an invisible name can be a tactical advantage (making it harder for enemies to call out your position) or a psychological one (implying you are an untraceable "pro"). The Secret Sauce: Unicode 4 invisible name
: Developers constantly patch these "vulnerabilities." When a method for a 4-character invisible name is discovered, it spreads through niche forums like a secret handshake before the next update breaks it. : Because it is technically a letter, the system accepts it