trema/ˈtɹiː.mə/EtymologyFrom Ancient Greek τρῆμα (trêma, “hole”), from τετραίνω (tetraínō, “perforate”), used for the dots on dice, via Dutch trema and French tréma.nounA diacritic consisting of two dots ( ¨ ) placed over a letter, used among other things to indicate umlaut or diaeresis.