used to indicate passive voice (placed before the doer of the action like "by" in English passive-voice sentences, or, if the doer is not mentioned, before the verb)
(since c. 2009) (sarcastic or jocular) used to indicate that the following word should be regarded as being in air quotes (as in 被旅遊|被旅游[bei4 lu : 3 you2] to "go on a trip")