诶 (誒) ēi

1. ēi interjection hey
   Domain: Modern Chinese 现代汉语
   
2. éi interjection (surprise)
   Domain: Modern Chinese 现代汉语
   
3. ěi interjection (disagreement)
   Domain: Modern Chinese 现代汉语
   
4. èi interjection (agreement)
   Domain: Modern Chinese 现代汉语
   
5. xī interjection sigh
   Domain: Modern Chinese 现代汉语
   

Also contained in

诶笑 、 诶诒