Namecoin
Namecoin is an alternative coin that was created as a result of the Bitcoin fork. It shares similar code, and the proof-of-work procedure is also the same, just like the 21 million coins limitation. However, it uses its own independent blockchain database.
NFC
NFC stands for Near-Field communication, a protocol widely used for communication between two electronic devices in very close proximity (about 4cm) to each other. It is mostly used for payment processing; this technology allows mobile device users to pay for goods and services easy and fast.