A client (Client) is a program that enables a user to interact with a blockchain network: transfers, balance checks, and data synchronization. The most familiar example of a client is a cryptocurrency wallet.

A whale (Whale) is a large holder of cryptocurrency whose volumes can noticeably influence the market. The trades of such participants often move the quotes of individual coins, so other traders watch their wallets closely.

Ether (Ether, ETH) is the native cryptocurrency of the Ethereum blockchain platform, the second most important in the industry. In traders' jargon there are playful distortions of the name — "kefir," "efir," "zemfir" — but they always refer to one asset.

Instamine is an unfair distribution of coins at the very earliest stage of a project's launch, when a large share of the issuance ends up with a narrow circle of participants. This undermines trust in the currency.

Delegated Proof of Stake is a consensus algorithm in which coin holders vote to choose a limited number of trusted nodes that create blocks on behalf of the entire network.