What does the '80' represent in the Audi 80?

I'm confused about why the Audi 80 is named that way. Is there any significance to the number 80?

The '80' in the Audi 80 represents the engine displacement, which was 1.6 liters when the car was first released. The numbers in Audi model names typically indicate the approximate engine displacement in liters.

The 80 actually stands for the internal model designation within Audi. The Audi 80 was the predecessor to the Audi A4 and was later also known as the Audi 90.