Down the rabbit hole of "jot and tittle" :
GotQuestions.org --
.Jots and tittles have to do with letters and pen strokes in Hebrew writing.
A jot is the tenth letter in the Hebrew alphabet and the smallest. It was written above the line and looks to us rather like an apostrophe:
Jot is related to our modern English word
iota, meaning “a very small amount.” The Hebrew spelling is
yod or
yodh. Many Bibles have a picture of a yod in
Psalm 119.
A tittle is even smaller than a jot. A tittle is a letter extension, a pen stroke that can differentiate one Hebrew letter from another. An example can be seen in the comparison between the Hebrew letters resh and daleth (or dalet):
The resh (on the left) is made with one smooth stroke. The daleth (on the right) is made with two strokes of the pen. The letters are very similar to each other, but the distinguishing mark of the daleth is the small extension of the roof of the letter:
And from Wictionary:
Etymology
A reference to
Matthew 5:18 in the
Bible (
King James Version; spelling modernized): “For verily I say unto you, till heaven and earth pass, one jot or one tittle, shall in no wise pass from the law, till all be fulfilled.”
[1] The
Koine Greek phrase is
ἰῶτα ἓν ἢ μία κεραία (iôta hèn ḕ mía keraía).
Jot (“the smallest letter or stroke of any writing, iota”) is derived from
Middle English jote (“jot, tittle, whit”),
[2] from
Latin iōta (“the Greek letter iota (Ι, ι)”), from
Ancient Greek ἰῶτα (iôta, “the letter Ι, ι, the smallest in the alphabet; (
figurative) a very small part of writing, jot”),
[3] from
Phoenician (y /yōd/).
Tittle (“small dot, stroke, or diacritical mark; (
figurative) small, insignificant amount, modicum, speck”) is derived from
Middle English title (“small written mark or stroke; smallest part”) [and other forms],
[4][5] from
Anglo-Norman title,
tittle [and other forms], and
Middle French titele,
title (“inscription”) (modern
French titre), and from their
etymon Latin titulus (“epitaph, inscription”); further etymology uncertain,
[6] but thought to be of
Etruscan origin.