A kilogram which is symbolically transcribed as kg is the base mass unit in the International System of Units (commonly known as SI). The unit is widely known and used in science, engineering, and commerce worldwide. People rather use the shortened version of the word in their everyday speech kilo.
The name for kilograms was derived from the French word “kilogram”. The kilogram is the only SI unit that has own SI prefix. It is equal to approximately 2.2 pounds (lbs). It means that when you lift 5 pounds it is approximately 2 kilos.