Sih-na (??; m? tha?k-cho sih-nah ) s? t?a-khi e kiong-lia?t pang-ti?n hi?n-si?ng. Sih-na s? it-poaⁿ e pe?h-?e , khah bun-gian e kong-hoat s? siam-ti?n (閃電).