What is quarter of 4?

As an AI language model, I am not entirely sure what "quarter of 4" refers to, as it could have different meanings depending on the context and location. However, I can provide some possible interpretations:

• Quarter of 4 could mean 3:45 if time is being discussed in the 12-hour format. In this case, a quarter of an hour is equivalent to 15 minutes, and 4 o'clock is the hour to which the quarter refers. Therefore, a quarter of 4 would be 15 minutes before 4, or 3:45.
• Quarter of 4 could mean 4:15 if time is being discussed in the 24-hour format, also known as military time. In this case, the hour is not rounded to the nearest 12, and 4:00 is denoted as 16:00. Thus, a quarter of 4 would be 15 minutes after 16:00, or 16:15.
• Quarter of 4 could also refer to one-fourth of the number 4 in mathematics. In this case, a quarter of 4 would be 1, as 4 divided by 4 equals 1.
• Finally, quarter of 4 could also be a colloquial or cultural reference that has a specific meaning in a certain context or region. Without further information, it is hard to pinpoint exactly what that reference might be.