Occurrence On Keyboards
The compose key can be found on the LK201 family of keyboards from Digital Equipment Corporation and its successors. The key can also be found on keyboards from Sun Microsystems.
Microsoft Windows and OS X do not support a compose key by default, therefore the key does not exist on most keyboards designed for modern PC hardware. When software supports compose key behavior, some other key is used. Common examples are the right-hand Windows key, the AltGr key, ⇧ Shift+AltGr, or the right-hand Ctrl key.
ISO/IEC 9995-7 designed a graphical symbol for this key, in ISO/IEC 9995-7 as symbol 15 “Compose Character”, and in ISO 7000 “Graphical symbols for use on equipment” as symbol ISO-7000-2021. This symbol is encoded in Unicode as U+2384 composition symbol (⎄) since version 3.0.0 of the standard. However, this symbol doesn't appear to be used by the industry.
Read more about this topic: Compose Key
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