Perpetual Contract A contract to buy or sell an asset that exists perpetually and does not expire. They are a class of financial derivatives similar to futures contracts, except that because they never expire, trading mimics a margin-based spot market.
Mark Price Price from the active Virtual AMM.
Index Price Market price of underlying asset. (from Oracle)
Position A position reflects the ownership of a quantity of contracts with either long/short exposure that are collateralized by the quote asset.
Position Notional Position * Mark Price