This is just a quite arrow to point to the number of quakes above a level 3 that have been happening in Iceland over the last few hours.
Icelandic Met Office). (Stars are for earthquakes over a level 3, and turn yellow, from green, after 24-hours)
Not quite sure what it means, but Jón Frímann has more of a description of what is going on.
There is no more . . . yet!