A three-dimensional nonvolatile memory device comprises a plurality of cell strings arranged perpendicular to a substrate. The magnetizable panel may be inset into the cover of the binder, or it may constitute substantially the entire front cover of the binder, or it may be inserted into a transparent pocket on the front cover of the binder. The electrical-energy meter also comprises a circuit-board support member comprising a rim portion fixedly coupled to the base, and a first bracket adjoining the rim portion. 7 and an Abbe number of 50 or more and 56 or less,Si4+ 3 cat % or more and 13 cat % or lessB3+ 40 cat % or more and 55 cat % or lessLa3+ 4 cat % or more and 9 cat % or lessCa2+ 6 cat % or more and 12 cat % or lessLi+ 11 cat % or more and 18 cat % or lessZn2+ 6 cat % or more and 12 cat % or lessZr4+ 1 cat % or more and 4 cat % or lessprovided that Si4+B3+ is 0.