The number sequence 881 is...
- a Paid Toll Free telephone number prefix in the USA
- the Port of Los Angeles Long Wharf, California State Historic Landmark #881
- the year AD 881 or the year 881 BC
- In astronomy, NGC 881 is an Sc type galaxy in the constellation Cetus.
- A bilingual play on words when text chatting in Mandarin Chinese or bilingually Mandarin Chinese and English. "881" is pronounced ba ba yi in Mandarin, and thus puns on "bye-bye." Probably an elaboration of the similar pun on "88" (ba-ba). See 88 (number).
- The international telephone dialling code for the Global Mobile Satellite System
- a prime number