When I was playing Tube Tycoon I had to think of a name and I was like "I need a really cool looking name". So I took the coolest letters in the alphabet (x, y and z), put them together with e and r to form Zeryx and then I capitalized some letters just for the looks. And when I wanted to name my osu account it told me that ZeRyX was too short, so added these [ ].
(Actually I wanted to make a new account named [ZeRyX] but I didn't know that you weren't allowed to do that, and so I had to use the supporter tag to change my name because before that my name was ShiroChoin and I don't wanna explain how I got that name...)