Theta
Also known as Θ, θ
chữ cái thứ 8 trong bảng chữ cái Hy Lạp
AI overview
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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