sarat (pl. sarati given) noun "letter", any individual significant mark, used of the letters of Rúmil after the invention of Fëanor's tengwar (WJ:396). Cf. sarmë.
Noldorin
tew
noun. letter
tîw
noun. letter
gammas
noun. s-sign (special sign used to mark a final -s in Tengwar)
@@@ tîw (Ety/TEK) appears to be plural, but is clearly glossed as singular “letter” with primitive form tekmē