I'm level level 15 which is nobunaga's ambiton. What does that mean?

anyways, I have been playing game I've had for a while due to lack of recent games funds. like Star wars battle front II [2-flag CTF is better then it used to be], Kingdom hearts II [playing Proud mode and it is harder than easy and normal], soul calibur III [create a charecter is fun], Super smash brothers melee [so f-ing addicting], The Legend of Zelda: the Wind Waker [faverate game period], Shadow of the Colossus [this game is so good, I'm comparing Legend of Zelda: twilight princess to this game], and some Psyconauts [not that much replay value, but still fun(ny) as heck].

Well thank you for reading.