I love the names of certain accent marks associated with letters and words (especially words borrowed from other languages).
Tittle—the dot above the lowercase i and j in
Tilde—the squiggly line (~) used as an accent
mark in certain languages, such as Spanish and Portuguese (e.g. ã).
Umlaut—the two dots above letters in Germanic
languages (e.g. ä).
Cedilla—the backward "c" symbol
under certain letters in French and other languages (e.g. façade)