Capsicum annuum 'Bird's Eye
 
Thai chilies (often called bird's eye chilies) are small, slender, and intensely hot peppers, typically measuring 1 to 3 inches in length. Ranging from 50,000 to 100,000 Scoville units, they pack a significant, lingering punch. They are staple ingredients in Southeast Asian cuisine, turning from vibrant green to red when mature, and offering a fruity, pungent flavor.