Pound
Symbol: lb (from Latin word Libra for balances)
The pound is not a SI-unit.
Historically, in different parts of the world, at different points in time, and for different applications, the pound (or its translation) has referred to broadly similar but not identical standards of mass or weight. One pound was approximately 467g in London and 510g in Nuremberg (Germany).
A number of different definitions have been used, the most common today being the international avoirdupois pound of exactly 0.45359237 kilograms.
1kg = 2.20462262lb