If the Suunto D6i has not counted the no-fly time down to zero, then repetitive dives belong to the same dive series.
Within each series, the dives are given numbers. The first dive of the series is DIVE 1, the second DIVE 2, and so on.
If you start a new dive with less than five (5) minutes at the surface, Suunto D6i treats the new dive as part of the previous dive. The dive time continues where it left off.
After five (5) minutes or more at the surface, any new dives are part of a repetitive dive series. The dive counter displayed in the planning mode adds one to each new dive in the repetitive series.
The planning mode allows you to review the no-decompression limits on the next dive in a series.