In the game, these are 1-star, 2-star, and 3-star items dropped by common enemies.

Common Enemies:

• Slimes

• Hilichurls

• Fatui

• Automatons

• Other Human Factions (Treasure Horders, Nobushi, Kairagi, The Eremites, Tribal Warriors)

• Mystical Beasts (Whopperflowers, Fungi, Cicins, Aberrants, Saurians)

Refer to this link for the complete list: https://genshin-impact.fandom.com/wiki/Common_Enemy