The Haihead (often shortened to HH) is one of three subfactions of the Foehn Revolt, formed in the aftermath of the Mental Omega War.
- The word Hai has different meanings in several languages:
- "Yes" in Japanese.
- "Hey" or "Hello" in Malay/Indonesian.
- "Sea" in Mandarin.
- "Shark" in Estonian, Finnish and Norwegian, which may allude to the Foehn's symbol.