16 (number) old days, weighing was done with a beam balance to make equal splits. It would be easier to split a heap of grains into sixteen equal parts through successive divisions than to split into ten parts. Chinese Taoists did finger computation on the trigrams and hexagrams by counting the finger tips and joints of the fingers with the tip of the thumb. Each hand can count up to 16 in such manner. The Chinese abacus uses two upper beads to represent the 5s and 5 lower beads to represent the 1s, the 7 beads can represent a hexadecimal digit from
Thumb-shift keyboard they found it difficult to use. They then came up with an idea of using thumb in conjunction with other fingers. Unlike the shift action with little finger in English keyboard, in which shift key is pressed and held while a character key is hit, this method uses simultaneous hit by thumb and other finger. This has several advantages. First, it enables each key to be conjugated in three ways: without thumb action, with the same hand thumb and with the thumb of the opposite hand. This means that the keyboard can accommodate half as much more characters than in