1) Computer keyboard 
CyKey (pronounced `sai-ki` or `psyche`) is a one-handed chorded keyboard, catering to both left- and right-handed users. It features nine keys, grouped into three sets of three. CyKey was introduced in 1996 by Bellaire Electronics. It was a follow-on to the Microwriter, meant to be used with personal computers and Palm PDAs. It was named after...