This is a common shorthand for "Complete" or "Collected," signaling that the archive contains the full run of the specified issues without missing pages.
A penchant for driving vintage sports cars that frequently break down during chases. Evolution of the Creative Team Clifton 01-19 -c- CBR NLT-Release
The -c- likely means “complete” (all issues in one torrent). This is a common shorthand for "Complete" or