What does 1.2 l engine size means?

Engine size, often referred to as displacement or capacity, is a measurement of the total volume swept by all the pistons in an internal combustion engine during one complete cycle (two strokes for a four-stroke engine, one stroke for a two-stroke engine). It's typically expressed in liters (L) or cubic centimeters (cc).

In the case of a 1.2L engine, it means that the total displacement or swept volume of all the cylinders in the engine is 1.2 liters. For instance, if the engine has four cylinders, each cylinder would have a displacement of 0.3 liters (300 cc), while if it has three cylinders, each cylinder would have a displacement of 0.4 liters (400 cc).