Sumi

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Sumi is the Japanese word for a form of activated charcoal that is used domestically in a wide range of applications. It is produced by firing certain species of oak or bamboo in clay kilns at temperatures of up to 1000 degrees celsius for as long as ten days. Unlike the ordinary charcoal used at a barbecue, sumi retains the natural shape of the raw wood while becoming harder and denser. After being removed from the kiln, washed and properly prepared, Sumi has the appearance and feel of polished stone.

Sumi also refers to the ink used for writing with a writing brush, particularly in calligraphy, a style called sumi-e in Japan.

Sumi also means Software Usability Measurement Inventory which is a commercial questionnaire and analysing solution for determining the usability of software. more information on [1].