Well, to be fair it applies to some PS3 hacks, meaning the early ones which utilized vulnerabilities in OtherOS to "break" out of "Jail" and allowed kernel-level access, but yeah, the term generally concerns an area of UNIX/FreeBSD hacking.FYI the term "jailbreak" applies only to iOS devices. Don't use it as a generic term for modding any system. For PSP, the correct term is either "modding" or "installing CFW" or something along those lines.