With Johto Mono, you can add a touch of retro to your text with the trema. In French orthography, the trema (dieresis) is a diacritical mark used to indicate that a following vowel is to be pronounced, e.g., naïve [naˈiːv], Noël [nøˈɛl], maïs [maˈiːs]. The trema is a small, curved mark that is placed above a letter.