circumflex
noun
ˈsɜːkəmfleks 
ˈsɜːrkəmfleks the mark placed over a vowel in some languages to show how it should be pronounced, as over the o in rôle
compare acute accent, grave2, tilde, umlaut
Definition of circumflex noun from the Oxford Advanced Learner's Dictionary
ˈsɜːkəmfleks ˈsɜːrkəmfleks 