The Thai title "P" (read Pee or Pii) means "ghost".
First Thai language film directed by a Westerner.
The film's onscreen title is a Latin small letter 'p' (U+0070) with a Thai character 'sara ii' (U+0E35) above it.
Dau works in a bar called "P Bar". The Thai word for ghost is "pee", so the bar could be translated to Ghost Bar.