The Namada Proof of Stake system uses the NAM token as the staking token. It features delegation to any number of validators and customizable validator validity predicates.
The PoS system is implemented as an account with the PoS Validity Predicate that governs the rules of the system. You can find its address in your wallet:
namada wallet address find --alias PoS
The system relies on the concept of epochs. An epoch is a range of consecutive blocks identified by consecutive natural numbers. Each epoch lasts a minimum duration and includes a minimum number of blocks since the beginning of the last epoch. These are defined by protocol parameters.
To query the current epoch:
namada client epoch