What is the meaning of Audi A4's engine size designation?

I've noticed that Audi uses a combination of numbers and letters to designate their engine sizes in the A4 model, like 2.0T or 3.0L. Can someone explain the meaning behind these designations and how it relates to performance?

The numbers in the engine size designation refer to the capacity of the engine in liters. The letters following the number signify the type of engine, with T for turbocharged and L for longitudinally mounted. For example, a 2.0T engine means it has a 2.0-liter capacity with a turbocharger.

The difference in these designations can also indicate the power output of the engine. Generally, a higher number or letter denotes a more powerful engine, but it's not always the case. It's best to look at the specific engine specs for a more accurate comparison.