Words at Play : Words For Things You Didn't Know Have Names
Definition:
tittle : the dot over i or j
Example Sentence:
In a handwritten business note, it's best to avoid smiley-face tittles.
Origin:
Tittle comes from the Latin titulus, which originally meant "title." Titulus came
to refer to marks such as the abbreviated form of n written over a vowel (like the Spanish tilde, which indirectly got its name
from titulus), and then to any mark above a letter.