The combination uu occurs rarely in the English language and only in words which are unfamiliar or archaic, except for three: continuum, muumuu and vacuum. With the exception of Muumuu (Hawaiian) and Weltanschauung (German), they derive from Latin roots. They are as follows: * Anschauung * Carduus * Continuum (also Continuüm) * Duumvir * Equus * Fatuus * Menstruum (also Menstruüm) * Muumuu * Mutuum * Nuuk * Obliquus * Residuum (also Residuüm) * Triduum (also Triduüm) * Vacuum * Weltanschauung