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Theta

File:Theta_uc_lc.svg · Wikimedia Commons · See Wikimedia Commons

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Also known as Θ, θ

chữ cái thứ 8 trong bảng chữ cái Hy Lạp

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Theta (Θ/θ) is the eighth letter of the Greek alphabet, originally derived from the Phoenician letter Teth. In ancient Greek numerical systems, theta represented the number 9 and remains a foundational character in Greek writing and mathematics.

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