From Wikipedia:

The Happy Hacking Keyboard (HHKB) is a small computer keyboard produced by PFU Limited of Japan, co-developed with Japanese computer scientist and pioneer Eiiti Wada. Its reduction of keys from the common 104-key layout down to 60 keys in the professional series is the basis for it having smaller overall proportions, yet full-sized keys. It returns the control key to its original position as on the early 84-key IBM Personal Computer/AT and XT layouts. The current models in production are the Happy Hacking Keyboard Professional Classic, Professional Hybrid (wired/wireless dual connectivity), and Professional Hybrid Type-S (silenced variant of Hybrid) all in either dark or light color schemes, and either blank or printed keycaps. The Professional Hybrid models are also available in a Japanese layout.