Each of the words the fingers inscribed on the wall is a measure of weight (like our ounce, pound, and ton, or milligram, gram, and kilogram). The basic Babylonian unit of weight was the gold shekel (tekel in this verse). The mena equalled 50 shekels; the upharsin (half a mena) equalled 25.
The four words, therefore, stood for: mena, 50 shekels; mena, tekel, 1 shekel; upharsin, 25 shekels. The total equalled 126 shekels.
In addition, each shekel can be divided into even smaller units (as a pound can be divided into ounces, for example). The shekel was equal to 20 gerahs
The 126 shekels is equivalent to 2,520 gerahs.
so..i am not totaly sure
but supposedly the words of the handwriting on the wall symbolize that God had "weighed" Belshazzar's kingdom and found it wanting. The empire would be given to the Medes and the Persians, who entered and captured the city of Babylon that same night. God was about to punish Belshazzar's realm for 2,520 years.
maybe i got a bad
translation..