barometer, bone of contention, catechism, cross-interrogatory, cross-question, debating point, demand, feeler, inquiry, interrogation, interrogative, interrogatory, issue, leader, leading question, moot point, pilot balloon, point at issue, point in question, probe, problem, query, question, question at issue, question mark, quodlibet, random sample, sample, sound, sounder, straw vote, topic, trial, vexed question, weather vane, weathercock