Yours, Etc.: Origins and Uses of 8 Sign-Offs
late 14c., "small stroke or point in writing," representing Latin apex in Late Latin sense of "accent mark over a vowel," borrowed (perhaps by influence of Provençal titule "the dot over -i-") from Latin titulus "inscription, heading" (see title (n.)).
a point, (Matt. 5:18; Luke 16:17), the minute point or stroke added to some letters of the Hebrew alphabet to distinguish them from others which they resemble; hence, the very least point.