Team I did a research
Based on this:
Default policies in Symantec Endpoint Security (broadcom.com)"
Some legacy policies still exist in Symantec Endpoint Security
and are visible to the Symantec Endpoint Security
Complete licensed users that migrated as users of individual applications such as Application Control or Application Isolation. All legacy policies are Application Isolation policies."
On the Legacy Policies appears : Platform
If someone at Broadcom can explain this I'll appreciate it.