Triangles.
It is called Golden Triangle.
It divides the frame with a diagonal line going from one corner to another corner.
The main purpose of this competition guideline is to convey a strong feeling like aggression, stability,
compassion, caring, instability and others for product photography.
The triangles can be used in the product, which you are going to shoot should convey one of these feelings
as well in this context.
You will have to read the product carefully and make the final decision about how you will able to apply
triangle competition in your product shooting.
Generally, the triangles are being used in architecture, landscape and movie as well.