to flutter in the wind

noisily, clattering, with a repetitive noise / repetitively, repeatedly, in succession / in a bustling manner, hurriedly, quickly

to flap, rattle, thrash, flounder

a rattling, flapping, a flapping sound, thrashing / (kabuki) a sound effect made with wooden clappers / a three-wheel vehicle; a motorcycle

flag; banner

banner (type of administrative division in Inner Mongolia, China)

flag

national flag / banner / standard

autonomous banner (type of administrative division in Inner Mongolia, China)

(maritime) signal flag