What do the numbers on the box or foil or bottle of fertilizers represent?

The numbers indicate the amount or percentage of macro elements nitrogen, phosphate, potassium, magnesium and calcium or micro elements iron, zinc, manganese, copper, boron and molybdenum in the fertilizer.
Regarding macro fertilizers, generally, the numbers on the packaging of 10 kg bags and more represent three nutrients (nitrogen, phosphorus and potash) . The first number refers to the amount of nitrogen, the second number refers to the amount of phosphate, and the third number refers to the amount of potassium. For example, 10-6-4 contains 10% nitrogen, 6% phosphate and 4% potassium.
In some fertilizers, apart from NPK, the word TE is also added to it, which means trace element or having rare elements or micronutrients.