The League was a measure used to measure long routes, much used in Portugal and Brazil, until the introduction of the metric system. There were several types of league, such as the Land League (old and present) and the Maritime League. In Brazil, the name of league was given the distance traveled on foot during an hour's walk. It should be noted that before the introduction of the metric system, each country had different measures for the league, and thus the league used in France was not the same as that of Germany, nor was that of Portugal. The situation was strange, as the units of measure being different within the country itself, from province to province.
The word Kilometer is a combination of the prefix "kilo" (meaning thousand) with the word meter. That is the reason why one kilometer equals exactly one thousand meters. In spite of this, it should be noted that the abbreviation for the word kilometer is "km". To finish, never place the plural in the kilometer symbol, that is, whether it is 1 km or 8 km, the abbreviation should always appear in the singular.