square = τετράγωνο
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pi is the ratio of the perimeter of a circle to its diameter. The Greek letter, pi, is the first letter of the word perimetros (Greek for perimeter).
The ancient Greeks, the word derives from a Greek word meaning 'diagonal of a circle'
Hexa is a prefix derived from the Greek word for 6.
The Greek letter chi (lower case): χ which is very similar to X except the forward stroke is curved at each end. It is part of unicode, found in Microsoft word and other programs, symbol number 03C7.
The symbol comes from the Greek alphabet.