"1 PM" refers to the time of day that is one hour after noon. It is part of the 12-hour clock system, which divides the day into two cycles: AM (ante meridiem) and PM (post meridiem). At 1 PM, the sun is typically at its highest point in the sky, depending on the season and geographical location. In many cultures, 1 PM is associated with lunchtime, when people often take a break from work or school to eat. This time can vary in significance; for example, in some countries, it may be common to have a large meal, while in others, it might be a quick snack.