This is a slightly different form of a KWL chart that is designed to get students thinking about what they already know about a new topic. KWL stands for "What I Know, What I Want to Learn and What I Learned". It's a powerful tool many teachers use to help students hook onto a framework of knowledge they already have. They have something they can now hang their new knowledge onto.
This short chart asks students to briefly fill in many different areas keeping them actively involved. It can be used before any new topic is introduced even if students have very little previous knowledge. (In science there may be topics they aren't able to generate 3 questions about because they simply don't know enough yet. You can always come back to the chart later). The goal isn't to see the chart as separate columns or lines to be filled out but rather a tool to activate their prior knowledge by linking new knowledge to old.
I use this prior to labs and PowerPoints to help kids focus and understand that even with dense material they almost already know something about it.