Nissan used the number 23 in racing because the number 2 translates to ni. And, the number 3 translates to san. 23 translates to ni-san.
Nissan.com is not owned by the car company, but by a single guy named Uzi Nissan. He has been fighting the car company in court since 1999.
No butts about it: Nissan has invented an artificial butt to test car seats.