what does the 60 mean in the resolution 1920x1080x60?

[shadybk]

I just built a gaming pc and I have a 1920x1080 60hz benq monitor and I started playing diablo 3 today when I noticed the screen resolutions options had a third component to them. There were options like 1920x1080x60 1920x1080x59 1920x1080x58 1920x1080x30 and many more, what does that third number mean?

 

[PeppermintFangs]

The third number represents the refresh rate of that resolution.

So 1920x1080x60 = 1080p Resolution at 60Hz