Number when pressing CTRL?

[Redeyes]

When you press CTRL when in-game firstly it displays your name, on the second press it displays your name and level and on the third press it displays a number, does anyone know what the number above your head means?

/Red

[Polly]

The number above your head is your partner card number. It's your "unique" identifier. Just like guild card numbers in PSO.