Nori (海苔) is the Japanese word for seaweed. There are many kinds of nori.
Roasted Nori (Nori Sheet)
Seasoning Nori (Ajitsuke Nori)
Kizami Nori (Shredded Nori Sheet)
Aonori (Dried Green Seaweed Powder)
We use aonori for yakisoba, okonomiyaki, and takoyaki, etc.