Hey there mhrth,
That would be the ISDB object for the SW SPam Experts services and would be the object with all of the associated IPs and ports for that service. This can be used in a variety of ways with policies in different places in FortiOS.
If it's being used in an active policy, it may be good to sort out why it is there or who used it. Is the Solar Winds service something that your company uses? I wouldn't block unless you had a specific reason for traffic not to ingress or egress from those IPs associated in the object.
The ISDB Reputation Database objects also can be used for effective deny policies though, and you may want to have a look at them.
Secure all the things!