This DisplayString records the highest number of IKE SAs that have ever been concurrently active at once, per 'IKE max concurrent SAs.' It's a peak-load watermark rather than a live count, so it's the number an admin checks when sizing gateway licensing or hardware against a VPN concurrent-session limit. If this peak value sits right at the gateway's licensed tunnel-count ceiling, that's a sign the appliance has already hit capacity at some point and needs an upgrade.