logical indicator also called indicator word, an expression that provides some help in identifying the conclusion of an argument or the premises offered in support of a conclusion. Common premise indicators include ‘for’, ‘because’, and ‘since’. Common conclusion indicators include ‘so’, ‘it follows that’, ‘hence’, ‘thus’, and ‘therefore’. Since Tom sat in the back of the room, he could not hear the performance clearly. Therefore, he could not write a proper review. ‘Since’ makes clear that Tom’s seat location is offered as a reason to explain his inability to hear the performance. ‘Therefore’ indicates that the proposition that Tom could not write a proper review is the conclusion of the argument. T.J.D.