A Doubler is a type of high-risk project that promises to double the invested funds in a short time. Such schemes belong to the dubious category and are extremely dangerous for an investor.

A dump (Dump) is a mass sale of an asset aimed at sharply lowering its price in a short time. It is often carried out by large holders and frequently serves as part of manipulative schemes.

A DAO is a decentralized autonomous organization governed by rules written into smart contracts and by collective decisions of its participants, rather than by the usual board of directors and management.

DDoS is a distributed attack in which many devices simultaneously flood a server with requests to overload it and make it unavailable to ordinary users. It is a frequent threat to crypto exchanges and pools.

Deflation is a sustained decline in the general level of prices in an economy over time, in which the purchasing power of the monetary unit grows. The phenomenon, the opposite of inflation, is often built into the design of cryptocurrencies.