I would say it's "fireworks," or as some people mentioned, you can also call it "sparkler."

In the UK and Ireland it's known as a "sparkler."

"Fireworks" is a general name for anything from this "sparkler" held by one person to the giant ones that light up the whole sky.

It's a sparkler https://www.google.com/search?q=sparkler&sxsrf=AOaemvKAOQbHU142oy8TX8fHFmSD9b8cEw:1634997705699&tbm=isch&ved=2ahUKEwjVndOL2eDzAhVDHc0KHUK6CdYQ_AUoAXoECAIQAw

That particular one is a starlight firework.