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zeta
Zeta (uppercase Ζ, lowercase ζ; (ギリシア語:ζήτα), classical or ''zḗta'', ''zíta'') is the sixth letter of the Greek alphabet. In the system of Greek numerals, it has a value of 7. It was derived from the Phoenician letter zayin . Letters that arose from zeta include the Roman Z and Cyrillic З.
==Name==
Unlike the other Greek letters, this letter did not take its name from the Phoenician letter from which it was derived; it was given a new name on the pattern of beta, eta and theta.
The word ''zeta'' is the ancestor of ''zed'' (UK) and ''zee'' (US), the names of the Latin letter Z in English. However, Swedish and many Romanic languages (such as Italian and Spanish), do not distinguish between the Greek and Roman forms of the letter; "''zeta''" is used to refer to the Roman letter Z as well as the Greek letter.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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