# Glossary Search definitions for Polyester product and trading terms. This glossary defines Polyester terminology. Each entry links to the page where the concept is covered in depth. For a broader map of how these systems fit together, see [Key Concepts](https://testnet.polyester.com/docs/user-docs/start/key-concepts). Term Definition Applies to Term [Address Book Entry](https://testnet.polyester.com/docs/user-docs/account/access-and-security/address-book-and-whitelist) Definition A saved destination address and its label. Applies to Wallet, Withdrawals, Security Term [API key](https://testnet.polyester.com/docs/user-docs/account/access-and-security/api-keys) Definition A revocable credential used to access Polyester programmatically. Applies to API, Security, Desktop Term [Base Asset](https://testnet.polyester.com/docs/user-docs/trade/spot-trading-overview#base-and-quote-assets) Definition The first asset in a trading pair and the asset being bought or sold. Applies to Trading, Markets Term [Deposit Flow](https://testnet.polyester.com/docs/user-docs/funds/deposit-assets) Definition The complete journey of an asset moving from an external chain into Polyester. Applies to Funds, Zipper, Scan Term [EOA](https://testnet.polyester.com/docs/user-docs/polyester-chain/smart-account) Definition A blockchain account controlled directly by a private key. Applies to Accounts, Security Term [Finality](https://testnet.polyester.com/docs/user-docs/reference/confirmation-requirements) Definition The point when a chain transaction is considered sufficiently permanent. Applies to Deposits, Withdrawals, Chains Term [Funding Account](https://testnet.polyester.com/docs/user-docs/funds/funding-account) Definition The account area where deposits arrive and assets remain available for transfers or withdrawals. Applies to Funds, Transfers, Deposits Term [Gas abstraction](https://testnet.polyester.com/docs/user-docs/polyester-chain/gasless-transactions) Definition Polyester's system for sponsoring Polyester Chain gas on supported actions. Applies to Polyester Chain, Accounts Term [GuardSigner](https://testnet.polyester.com/docs/user-docs/account/access-and-security/sign-in-and-ownership) Definition A security signer used to approve protected account actions. Applies to Accounts, Security Term [Index Price](https://testnet.polyester.com/docs/user-docs/trade/spot-trading-overview) Definition A volume-weighted reference price built from normalized Asset prices across leading centralized and decentralized exchanges. Applies to Trading, Funds, Lending Term [Main Account](https://testnet.polyester.com/docs/user-docs/start/create-account) Definition The main Polyester account that owns its Subaccounts. Applies to Accounts, Subaccounts Term [Maker](https://testnet.polyester.com/docs/user-docs/fees-and-vip/trading-fees) Definition An order that rests on the order book and provides liquidity. Applies to Trading, Fees, API Term [Market Maker](https://testnet.polyester.com/docs/user-docs/fees-and-vip/trading-fees) Definition A participant or strategy that quotes buy and sell orders to provide liquidity to a market. Applies to — Term [MFA](https://testnet.polyester.com/docs/user-docs/account/access-and-security/mfa-and-recovery-codes) Definition An additional identity check used to protect sensitive account actions. Applies to Accounts, Security Term [Owner wallet](https://testnet.polyester.com/docs/user-docs/polyester-chain/smart-account) Definition The external or embedded wallet that authorizes actions for your Polyester Smart account. Applies to Accounts, Security Term [$P](https://testnet.polyester.com/docs/user-docs/polyester-chain/gasless-transactions) Definition The native gas asset of Polyester Chain. Polyester sponsors gas for supported product actions. Applies to Polyester Chain, Gas Term [PolyEngine](https://testnet.polyester.com/docs/user-docs/polyengine/overview) Definition Polyester's high-performance system for order admission, matching, and settlement. Applies to Trading, Matching, Settlement Term [Polyester Chain](https://testnet.polyester.com/docs/user-docs/polyester-chain/overview) Definition Polyester's EVM-compatible blockchain for accounts, assets, and protocol activity. Applies to Polyester Chain, Accounts, Assets Term [Polyester Scan](https://testnet.polyester.com/docs/user-docs/polyester-scan/overview) Definition The public explorer for Polyester Chain activity, contracts, assets, and Zipper Flows. Applies to Scan, Explorer Term [Post-only](https://testnet.polyester.com/docs/user-docs/trade/order-types/time-in-force-and-post-only) Definition An order setting that prevents the order from immediately executing as a taker. Applies to Trading, Orders, API Term [Quote Asset](https://testnet.polyester.com/docs/user-docs/trade/spot-trading-overview#base-and-quote-assets) Definition The second asset in a pair and the asset used to express its price. Applies to Trading, Markets Term [Route](https://testnet.polyester.com/docs/user-docs/zipper/overview) Definition The configured connection between one asset on an external chain and its matching Zipped Asset on Polyester Chain. Applies to Zipper, Funds, Deposits Term [Smart account](https://testnet.polyester.com/docs/user-docs/polyester-chain/smart-account) Definition The Safe account on Polyester Chain that represents a Polyester account. Applies to Accounts, Polyester Chain Term [Subaccount](https://testnet.polyester.com/docs/user-docs/subaccounts/subaccounts-overview) Definition A separate account under a Main Account with its own balances, members, and activity. Applies to Accounts, Trading, API Term [Taker](https://testnet.polyester.com/docs/user-docs/fees-and-vip/trading-fees) Definition An incoming order that executes against liquidity already on the order book. Applies to Trading, Fees, API Term [Unified Asset](https://testnet.polyester.com/docs/user-docs/polyester-scan/zassets-and-uassets) Definition The account-facing balance that combines compatible source-chain asset routes. Applies to Funds, Trading, Zipper Term [Unified Trading Account](https://testnet.polyester.com/docs/user-docs/funds/trading-account) Definition The private balance area used for trading, lending, collateral, and margin. Applies to Trading, Funds, Margin Term [Vault](https://testnet.polyester.com/docs/user-docs/zipper/vaults) Definition A protected external custody location used by Zipper for a specific asset route. Applies to Zipper, Custody Term [Withdrawal Flow](https://testnet.polyester.com/docs/user-docs/funds/withdraw-assets) Definition The complete journey of an asset moving from Polyester to an external chain. Applies to Funds, Zipper, Scan Term [Zipped Asset](https://testnet.polyester.com/docs/user-docs/polyester-scan/zassets-and-uassets) Definition The Polyester Chain representation of one asset from one source chain. Applies to Funds, Zipper, Scan Term [Zipper](https://testnet.polyester.com/docs/user-docs/zipper/overview) Definition Polyester's protocol for bringing supported external assets onto and off Polyester Chain. Applies to Funds, Deposits, Withdrawals