What does CMLXI stand for?

CM LXI is a representation of the number 961 in Roman system of numerals....

Explanation:

I - 1

V- 5

X- 10

L- 50

C- 100

D- 500

M- 1000

CM- represents 900 ( 1000-100 )

LX- represents 60 ( 50+ 10 )

I - represents 1.

therefore, CMLXI represents ( 900+60+1 ) 961.............