How to sign the letter N in ASL
A fist with the thumb tucked under two fingers (index and middle), peeking out between the middle and ring fingers.
Easy to confuse. M tucks the thumb one finger further toward the pinky (under three fingers). T tucks the thumb under only the index finger.
N is one of the six fisted letters - A, E, M, N, S, T - that differ only by where the thumb sits. You cannot check these on yourself, which is what the camera is for.