The word for today is…
tittle (noun) -
1: a point or small sign used as a diacritical mark in writing or printing
2: a very small part
Source : Merriam-Webster
Etymology : When most of us dot our i's and cross our t's, our minds are with the words we are writing rather than the anatomy of the letters we employ. But those dots and crosses? The types who love type have names for them. The mark that sits above the lowercase i (as well as j) is known as a "tittle". Tittle comes from the Medieval Latin noun titulus, meaning "title," and has also been used over the centuries for diacritical marks including tildes, as well as any small mark or sign in writing or printing—hence the figurative use of tittle to refer to a very small part of something. For those curious about additional letter components, stroke refers to one of the lines that form a letter, including the horizontal lines that mark the lowercase letters t and f (which may be described more specifically as a "cross strokes"). Typographers even have a word for the negative space enclosed by strokes, such as the hole in the letter o: it's known as a “counter.”
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