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A rectangle with all four side lengths equal. It is a regular four-sided polygon. Rotations and translations preserve this definition; its sides need not be parallel to the coordinate axes.
Square, now known as Block, Inc., is a financial services and mobile payment company co-founded by Jack Dorsey and Jim McKelvey in 2009. Originally, Square was best known for its point-of-sale (POS) systems and mobile payment solutions that allowed small businesses to accept card payments using a smartphone or tablet equipped with a card reader.