BLOCKv (VEE) is the utility Ethereum token of the BLOCKv platform, where users can develop virtual objects (vAtoms). You can trade VEE tokens with a number of exchanges. BLOCKv (VEE) token was launched in 2017.
Scry.info (DDD) is an Ethereum-based token of the Scry.info global data aggregator. DDD token is listed on a few exchanges paired against bitcoin and Ethereum. In this abbreviation, “DDD” stands for "distributed data depositary".
Bitcoin Gold (BTG) is a Bitcoin hard fork that took place in 2017. The initial goal behind creation of Bitcoin Gold was to increase level of decentralization of Bitcoin network as it became obvious that most of the network is controlled by few mining pools.