A word appearing as ᴱQ. nelqa in the Qenya Lexicon of the 1910s, glossed “cornered, often = square” and based on the early root ᴱ√NELE “point” which in this document was also the basis for ᴱQ. nelde “four” (QL/65).

Neo-Quenya: In Tolkien’s later writings Q. neldë and √NEL meant “three”, but I think ᴺQ. nelqua “cornered, *angled” might be retained in reference to [ᴹQ.] neltil “triangle” (Ety/NEL).