What is bottom of the hour?

The term "bottom of the hour" refers to the point of time that is exactly half an hour past the hour. For example, if it is 2:30 pm, then 2:30 pm is the bottom of the hour. This term is commonly used by broadcast media such as radio and television stations to indicate when certain programming or segments will start or end. In some cases, news updates or other important information may be scheduled to air at the bottom of the hour. It is also a common point of reference used in business meetings or scheduling appointments.