12345678Keyworddark cloudscloudyovercastFrequency#3636Strokes8ReadingstánMnemonicThe sun 日 hidden behind a cloud 云Stroke orderComposed of日day云to sayUsed in vocabulary昙tándark clouds昙花一现tánhuāyīxiànlit. the night-blooming cactus shows once; flash in the pan (idiom); short-lived昙花tánhuāDutchman's pipe cactus, aka Queen of the Night cactus (Epiphyllum oxypetalum)