what does this game format mean ?

does anyone know how to interpret game formats like this:

4S/5R/3D/SS/G60+10

Looks like a 60 minute with 10 second increment, but what does the rest mean ?

Thanks 

4S = 4 Sections (e.g. a Section could be Under 1100 rating, 1100-1499 Rating, etc)

5R = 5 Rounds (i.e. 5 games)

SS = Swiss System - the tournament and pairing format

G60+10 = 60 minutes on each players clock with 10 second incremement.

The thing I'm not familiar with is what the "3D" means.  A pure guess is that it means "3 Day" and the tournament occurs over a three day timespan.

the tourny is over 3 days, so that fits. And thank you for the rest of the info, that all fits as well!

Thanks again for the help.