এটা কি?

A visual representation of different dynamics.

এটা কোথায় পাওয়া যায়?

DIY and bring it with you.

আমি কিভাবে এটা ব্যবহার করব?

Move an arrow or other visual indicator to show students where they should be on the dynamic scale. If possible, correlate it to language about volume that they already know (e.g., a class might use a number or color system to indicate quiet voices, speaking for a large group, etc).