various Sámi languages. This keyboard has the same function for all the keys engraved on the regular Swedish keyboard, and the additional letters are available through the key. On Macintosh computers, the Swedish and Swedish Pro keyboards differ somewhat from the image shown above, especially as regards the characters available using the or keys. (on the upper row) produces the ° sign, and produces the € sign. The digit keys produce ©@£$∞§|[]≈ with and ¡"¥¢‰¶\{}≠ with . On Linux systems, the Swedish keyboard may also give access to additional characters as follows: first row: ¶¡@£$€¥{[]}\± and ¾¹²³¼¢⅝÷«»°¿¬ second row: @ł€®þ←↓→œþ"~ and ΩŁ¢®Þ¥↑ıŒÞ°ˇ third row: ªßðđŋħjĸłøæ´ and º§ÐªŊĦJ&ŁØÆ× fourth row: |«»©""nµ¸·̣ and ¦<>©‘’Nº˛˙˙ Several of these characters function as dead keys. Turkish Today the majority of Turkish keyboards are based on QWERTY (the so-called Q-keyboard layout), although there is also the older F-keyboard layout specifically designed for the language. Vietnamese The Vietnamese keyboard layout is an extended Latin QWERTY layout. The letters Ă, Â, Ê, and Ô are found on what would be the number keys – on the US English keyboard, with – producing the tonal marks (grave accent, hook, tilde, acute accent and dot below, in that order), producing Đ, producing the đồng sign (₫) when not shifted, and brackets () producing Ư and Ơ. Multilingual variants Multilingual keyboard layouts, unlike the default layouts supplied for one language and market, try to make it possible for the user to type in any of several languages using the same number of keys. Mostly this is done by adding a further virtual layer in addition to the -key by means of (or 'right ' reused as such), which contains a further repertoire of symbols and diacritics used by the desired languages. This section also tries to arrange the layouts in ascending order by the number of possible languages and not chronologically according to the Latin alphabet as usual. United Kingdom (Extended) Layout Windows From Windows XP SP2 onwards, Microsoft has included a variant of the British QWERTY keyboard (the "United Kingdom Extended" keyboard layout) that can additionally generate several diacritical marks. This supports input on a standard physical UK keyboard for many languages without changing positions of frequently used keys, which is useful when working with text in Welsh, Scots Gaelic and Irish — languages native to parts of the UK (Wales, parts of Scotland and Northern Ireland respectively). In this