ROI

It is number of transactions done per second. For example, there are 10 transactions of Bitcoin done in 1-minute. The TPS would be 10 transactions/60 seconds = ~0.17 TPS.

Microtransaction is a system that made very small payments possible in buying the common digital goods and services, such as purchasing items in a game.

The lowest point (in price, in market capitalization) that a cryptocurrency has been in history.

Atomic Swap refers to the exchange of cryptocurrencies that operate in different block chains without intermediaries.