rsts/ccc/cache07 is a SAP Parameter attribute which is used to control Size of cache for long multibyte characters 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 .
Size of the subcache of the character set buffer ("CCC") to be used for
long multibyte characters. This characters are in table TCP07, for
example.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.