What does the arrow on the timeline represent?

The timeline is a symbol for the flow of human history. It is customary to mark certain dates on this line. Accordingly, the line itself has certain segments. Each of these segments takes a specific period of time.

This gives an understanding of the duration of a particular era. Thanks to the timeline, you can compare the duration of any epoch or period. For example, the Stone Age lasted over 100,000 years. And the Bronze Age took only a few millennia. Thus, the timeline helps to analyze history, to understand its course and the laws of human development.