A root in The Etymologies of the 1930s glossed “know, understand” with derivatives ᴹQ. saira “wise” and ᴹQ. sairon “wizard” (Ety/SAY). It is probably connected to later words like Q. alasaila “unwise” (PE22/154) and S. sael “wise” (MR/305) in documents from the 1950s and 60s, as suggested by Carl Hostetter (VT41/18).
Middle Primitive Elvish
teñ
root. line, direction
tēñe
noun. line, row
tēra
adjective. straight, right
ñgolda
adjective. wise
ista-
verb. to know
lepet
root. finger
ndar
root. sign
say
root. know, understand
tankāta-
verb. to make firm
tekna
noun. a letter
A rejected root in The Etymologies of the 1930s with a single derivative: ᴹQ. narwe “sign, token”, along with an unglossed (and probably incomplete) form nar... (EtyAC/NDAR).