cPanel release tiers explained
LTS A well-tested and proven version that cPanel, L.L.C. supports for one full year.
STABLE A version that is feature-complete, fully tested, and is in widespread use.
RELEASE A version that is feature-complete and well tested.
CURRENT A “release candidate” version that is tested but may not be feature-complete.
EDGE A development version for testing only and not for production servers.
How to set the release tier via terminal
Command to check the exact cPanel version