abbreviation for to be confirmed: used when something has not yet been decided or is not yet known

The meeting till take place on 4 April, venue TBC. 会议将于4月4日举行，地点待定。

The second girl (name tbc) was seen leaving the club a few minutes later. 有人看到 第二名女孩（姓名有待确认）几分钟后离开了俱乐部。