I learned this from a box of bowls on eBay.
These are actually a very good deal on eBay. The best, I think. So I drew it on a cell phone app and that said the kanji means bowl, vessel, container, and gave a bunch of variations. Then I looked up "bowl" in kanji online and they show 1/4 of this, just one box with a horizontal line over it and one connecting slanted roof. With a bunch of combinations, like porcelain bowl, rice bowl, etc. And that made me think maybe the four-squares version means a set of 4 bowls, but the app does not confirm that. Confusing innit.
All these things come in fancy-pants boxes and I have no need for those. It's a bummer throwing them away and a bummer storing them. Knives, and bowls, and dishes and such. I think they're intended for storage, and as gifts, and shipping. Or to make you think, "hey man, I'm really getting something."