snc/identity/as is a SAP Parameter attribute which is used to control Name of application server for external Security Syst. information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
This parameter specifies the name and the name type of the application
server in the external security system.
Name of external security system
Depending on the external product, the name can be, for example, an
X.500 name or another product-specific name. The name is specified in
the external system.
Name type
The name type is specified in a prefix (see below)
See SAP Parameter Documentation for full SAP documentation for this profile parameter.