Pundi X (NPXS) is the utility token of the eponymous platform and based on the Ethereum protocol. The cryptocurrency pairs including NPXS are listed on multiple exchanges.
Litecoin was created in 2011 by a Google employee Charlie Lee. Currently, this cryptocurrency is one of the largest by market capitalization. Litecoin was created as one of the first forks of the Bitcoin blockchain. Also, it is safe to say that Litecoin is one of the first altcoins. While Bitcoin is based on SHA-256 algorithm, Litecoin utilizes a lighter scrypt algorithm.
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".