APM : CCU "Full" session VS Access "LTM_APM" session

First the session type just indicates the type of APM session:

N/A: Still doing login for example.

network_access: A webtop with a network access resource (VPN)

web_application: A virtual server with APM profile and a rewrite profile (APM doing L7 reverse proxy)

full: A full webtop, can have multiple type of resources, including a network access resource (VPN)

ltm_apm: A virtual server with an APM profile, just for authentication for example.

In the list above I have 5 sessions:

Those sessions may or may not count as one CCU, it will depend on resource used in the session:

https://support.f5.com/csp/article/K13267

You can see the number of CCUs used via command line:

https://support.f5.com/csp/article/K15032

Concluding, the tmsh command will tell you how many CCU you have used.

Looking the type of session does not directly indicate that is using a CCU, because you could have a session type full that is only doing Microsoft RDP and that does not use CCUs.