רָב֧וּעַ הָיָ֛ה כָּפ֖וּל עָשׂ֣וּ אֶת־הַחֹ֑שֶׁן זֶ֧רֶת אָרְכּ֛וֹ וְזֶ֥רֶת רָחְבּ֖וֹ כָּפֽוּל׃
It was four-square; they made the breastplate double; a span was the length thereof, and a span the breadth thereof, being double.
Targum Jonathan on Exodus
Foursquare was it; doubled they made the breastplate, a span its length, and a span its breadth.