En (cuneiform)
The cuneiform sign en, is a common-use sign of the Amarna letters, the Epic of Gilgamesh, and other cuneiform texts. It has a secondary sub-use in the Amarna letters for ka4.
Linguistically, it has the alphabetical usage in texts for n, e, or en, and also a replacement for "e", by vowels, a, or i, or u.