In *The Beginner's Guide*, there are a number of places where there are three dots in the same pattern.

The narrator, Davey, also mentions them a couple of times.

Here's a few examples:

 - https://i.sstatic.net/aVOBx.png
 - https://i.sstatic.net/gGXqw.jpg
 - https://i.sstatic.net/BiZUU.jpg

What's the meaning behind them?