The EULA (End User License Agreement) and pricing pages, etc. commonly refer to slots. What exactly is a slot?
‘slot’ is utilized when a single user connection is established to a given TeamSpeak server. The maximum “slots” or “slot count” is configured on the TeamSpeak server itself and further defines the maximum # users that can simultaneously connect to a given TeamSpeak server at any time. So, for example, a server configured for 50 slots will allow up to 50 simultaneous user connections before it yields a “server full” message to the 51st user attempting to connect with the server.