L is the number 50 in Roman Numerals.
It stands for 2001.
VI are the Roman numrals for the number six.
The 7 main Roman numerals are: M D C L X V and I
16
MCXVII
LV
D
V
That is 29.
The X before the L means 50 minus 10. This converect to 43 in Arabic numerals.
10 = X in Roman numerals
3409 in Roman numerals is MMMCDIX