Is it jujitsu or jujutsu or jiu jitsu?
Depends on who you ask. It means the same thing (the gentle fighting art or the ability to use your opponent’s energy and leverage against them using joint locks, chokes and throws). Typically, old Japanese styles use “Jujutsu” (JJJ), and more modern/mixed styles use “jujitsu”. In Brazil, it is called Jiu Jitsu (BJJ).