BEI

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BEI or B.E.I. may refer to :

• Binary ethylenimine, an inactivant used in the inactivation of the foot-and-mouth disease virus
• Business Entity Identifier, an ISO 9362 Bank Identifier Code (BIC) assigned to a non-financial entity
• Balanced Ecology, Inc.
• {{ill|Bureau des enquêtes indépendantes|fr}}), Quebec's police watchdog
• Indonesia Stock Exchange or Bursa Efek Indonesia