Read 乜 when it is the surname Nie — a rare Chinese family name, distinct from the common surname 聂. The everyday verb 'to squint' uses the miē reading instead.
Components
ideograph
乜niè
to squint
A two-stroke unitary graph not analyzable into independent parts — a single curved sweep plus a hook. Indexed under Kangxi #5 乙 (the 'second / bending' radical) by tradition, since the curving stroke matches that radical group.
Filed under radical 乙 (yǐ, #5) by convention. 乙 is not a separate component in 乜, so no strokes are highlighted.