|Integer ASCII code:||14|
|Binary code:||0000 1110|
Unicode symbol: ␎, int code: 9230 (html ␎) hex code: 240E (html ␎)
Allows to move to an alternative character set.
Shift Out (SO) and Shift In (SI) are all ASCII control characters 14 and 15, accordingly (0x0E and 0x0F). Sometimes they are also called "Control-N" and "Control-O".
The initial meaning of SO and SI allowed to shift a colored ribbon, split lengthwise, usually with red and black colors, up and down to the other color in an electro-mechanical typewriter or teleprinter, for example in the Teletype Model 38, in order to automate the same function of manual typewriters. Black was the traditional external default value color, so it was shifted "in" or "out" with the other color on the ribbon.
Technological developments that happened later incited another way of use of this function - for switching to a different font or character set and back. For example, it was used in the Russian character set, which is known as KOI7. The principle was as following. SO starts its work on printing Russian letters, and SI starts printing Latin letters again. SO/SI control characters also are used in order to display VT-100 pseudographics, and emoji (Japanese picture icons) on SoftBank Mobile. ISO/IEC 2022 standard determines their generalized usage.
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