In Linux w/ XCmpose or similar, or Hacker's Keyboard on Android, or Wincompose on Windows it is also the compose key then oe. XCompose also has a lot of customi

In Linux w/ XCmpose or similar, or Hacker's Keyboard on Android, or Wincompose on Windows it is also the compose key then oe. XCompose also has a lot of customisable digraph support. See Kragen's list. So. <compose>oe = œ I usually bind capslock to the compose key in Linux (and Windows with Wincompose). Hacker's Keyboard has a dedicated button.