(1) For recording information, see
note taking.
(2) A laptop computer that weighs roughly four to six pounds. When laptops routinely weighed more than 10 pounds, lighter models were coined notebooks. Portable computers that weigh less than four pounds may be called a "subnotebook" or "mini laptop." For marketing purposes, new titles for portable computers are coined all the time. See
laptop,
subnotebook,
netbook,
MacBook and
Ultrabook.