There is no intrinsic limit on sequence length, which should respect both the rules of mnemonics and ergonomics, and feasibility within a comprehensive compose tree. For instance Compose o c will produce the copyright symbol ©, and Compose A E will produce Æ. Non-accented characters are generally constructed from letters that when overtyped or sequenced would produce something like the character. This allows multiple diacritics, for instance typing Compose ' ^ a for ấ. This order is still in use, however the inverse order known from accent-mark dead keys present on the last typewriters is used today: Compose ~ n for ñ. For example Compose n ~ produced the character ñ. This makes it possible for experienced typists to enter composed characters rapidly.Įarlier versions of compose sequences followed handwriting and the overstrike technique by putting the letter first and diacritics second.
If the Compose key is not also a modifier key, then key rollover means the compose key does not have to be released before the subsequent keystrokes.
#Compose a number iso
ISO keyboard symbol for "Compose Character" There is no keyboard LED or other physical indicator that a compose sequence is ongoing, though the OS may show some icon (such as the "Compose Character" symbol, below) on the user's text input field. Common examples are the right-hand Windows key, the AltGr key, or one of the Ctrl keys.
#Compose a number software
When software supports compose key behaviour, some other key is used.
#Compose a number Pc
This symbol is encoded in Unicode as U+2384 ⎄ COMPOSITION SYMBOL.īecause Microsoft Windows and macOS do not support a compose key by default, the key does not exist on most keyboards designed for modern PC hardware. 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. On the keyboards of Sun Type 5 and 6 workstations, the Compose LED is placed in the keycap (see picture below).
In 1987, Sun Microsystems released the Sun4, the first dedicated Unix workstation that had a compose key.
While the LK201 introduced the group of command keys between the alphanumerical block and the numerical keypad, and the "inverted T" arrangement of arrow keys, which have become standard, the compose key by contrast did not become a standard. The keyboard included an LED indicating that a Compose sequence is on-going. The Compose Character key was introduced by engineers at Digital Equipment Corporation (DEC) on the LK201 keyboard, available since 1983 with the VT220 terminal. įor instance, typing Compose followed by ~ and then n will insert ñ.Ĭompose keys are most popular on Linux and other systems using the X Window System, but software exists to implement them on Windows and macOS. Computer key to initiate glyph merger Xfce keyboard layout settings window, featuring a compose-key optionĪ compose key (sometimes called multi key) is a key on a computer keyboard that indicates that the following (usually 2 or more) keystrokes trigger the insertion of an alternate character, typically a precomposed character or a symbol.
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