thetaKK [ˋθetə] /ˈθeɪtə/發音名詞1西塔、希臘字母 θIn this formula, theta represents the angle between the two lines.在這個公式裡,θ 代表兩條線之間的夾角。2θ波、西塔波多指腦波Theta appears in the brain during light sleep and deep relaxation.θ波會在淺眠和深度放鬆時出現在大腦中。