1500 can refer to different things depending on the context. Here are some possible meanings:

• 1500 in military time: In military time, 1500 refers to 3:00 PM using the 12-hour clock notation, or 15:00 using the 24-hour clock notation. It is pronounced as "fifteen hundred hours" or "one-five-zero-zero hours".

• 1500 in standard time: In standard time, 1500 is equivalent to 3:00 PM.

• 1500 as a number: 1500 is a natural number that can be expressed in words as "one thousand five hundred" or "fifteen hundred".

It is important to note that the meaning of 1500 can vary depending on the context, so it is always necessary to consider the context in which it is used.