However, you could use some general terms depending on the context:
* A collection of bangles
* A set of bangles
* A pile of bangles
* A stack of bangles
* A display of bangles
You could also get creative and use more descriptive terms:
* A jingle of bangles (referencing the sound they make)
* A shimmer of bangles (referencing their shine)
* A cascade of bangles (if they are arranged in a flowing way)
Ultimately, the best term depends on how you want to portray the bangles and the specific situation.