In the example SUSHI/ETH, SUSHI is the token asset (aka base asset) and ETH is the pair asset (aka quote asset).
Tokemak deploys liquidity on Cycles, which will be set to weekly upon live liquidity deployment. Assets deposited or TOKE staked mid-Cycle only become 'active' when a new Cycle begins. Assets requested to be withdrawn cannot be fully withdrawn until a new Cycle begins. TOKE rewards only begin for newly deposited assets or staked TOKE at the start of a new Cycle. See Cycles for more info.
Liquidity Directors (or LDs) are users that stake their TOKE and allocate votes to a specific Token Reactor, in order to direct the inventory of a specific asset as liquidity to a preferred exchange. LDs can acquire TOKE through providing liquidity in the form of rewards, or traded on the open market.
TOKE votes for liquidity direction is queued to be deployed on the next Cycle. LD TOKE reward emissions don't begin until the beginning of the following Cycle.
Liquidity Providers (or LPs) are participants that deposit (single asset stake) assets into a specific Token Reactor, in order to contribute to the inventory that will then be paired and deployed as liquidity.
LPs assets are then queued to be deployed on the next Cycle. LP TOKE reward emissions don't begin until the beginning of the following Cycle.
Pair Reactors are pooled deposits (by LPs) of ETH, USDC, FRAX, and other stablecoins that are then paired with assets from Token Reactors. The Pair Reactor section can be found above the Token Reactors on the dapp.
A Token Reactor is simply another name for a specific asset's Tokemak reactor. Tokemak is the name for the protocol at-large, and an individual "Tokemak" is known as a Token Reactor.
LPs deposit their assets into Token Reactors, and LDs allocate their staked TOKE to specific Token Reactors in order to direct liquidity of that asset, earning specified Token Reactor APR.
The POA, or Protocol Owned Assets, is in reference to: Tokemak's treasury, the assets within the protocol that are utilized for liquidity deployment, asset reserves utilized for IL mitigation, and trading fees accrued from providing liquidity.
Individual LPs usually view impermanent loss as the difference in total value of the assets deployed after shifting of the ratio of the pool assets due to a change in their exchange rate.
Tokemak views impermanent loss from the perspective of the negative change in quantity of one of the assets deployed to an AMM trading venue. In other words, Tokemak tries to ensure that LPs can withdraw the same quantity of assets they initially deposited into the system. This approach combined with other specifics of the system allows for rebalancing of assets that should only result in a net loss on the system level in extreme market conditions.