the.com/hyphenation

means The practice of splitting a word with a hyphen at the end of a line so text can wrap more evenly, typically done at syllable boundaries.

from From Greek 'hyphen,' meaning 'together,' itself built from 'hypo' (under) plus 'hen' (one) — literally 'in one.' Ancient Greek scribes wrote it as a little curved mark beneath two letters to show they belonged together as a single word, the opposite job of today's line-break hyphen, which instead marks a word torn apart. The word traveled through Latin into English scribal and printing practice, where the mark's use shifted toward showing division rather than unity.