ict/min_compression_size is a SAP Parameter attribute which is used to control Minimum size in bytes for a gzip compressable HTTP message 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 .
Minimum size of an HTTP response for compression. Smaller responses are,
as a rule, not compressed.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.