It has a secondary sub-use in the Amarna letters for addressing the Pharaoh, from the vassal states of Canaan.
In some Amarna letters the sub-use of ni is lí, for spelling "bēlu", be-lí often .
In EA 9 especially, there is a 'scribe margin line', both left and right on the clay tablet obverse.
For the right margin, some words in the lower paragraphs of the obverse (Para 4–7), some words ending with ni/lí, have the sign lengthened, and sitting upon the right margin line-(the cuneiform text, in EA 9, reads: left-to-right).
Ì, the Sumerogram is Akkadian language "šamnu", for English "oil".