In Arabic, 8 is written as ∧and 1 is written as |.Thus,on your left hand, the marks appear as ∧| which can be written as 81 in English.
On the right hand, the marks appear as |∧,which can be written as 18.
Here is the interesting part, if you were to add 81 and 18,it becomes 99,which is the number of Allah's beautiful names that appear in the Holy Qur'an.Also,if you subtract 18 from 81,it becomes 63.
At the age of 63,Prophet Muhammad (SAW) passed away and the religion of Islam was completed! Amazing,isn't it? It is as if kalimah is written on your hands.
There is no God but Allah and Muhammad is his messenger.