QWERTY official languages of the European Union (excluding Bulgarian and Greek). Some letters, like Ł/ł needed for Slavic languages, are accessed by a special "overstrike" key combination acting like a dead key. However, the Romanian letters Ș/ș and Ț/ț (S/s and T/t with comma below) are not supported; the presumption is that Ş/ş and Ţ/ţ (with cedilla) suffice as surrogates. The Icelandic keyboard layout is different from the standard QWERTY keyboard because the Icelandic alphabet has some special letters, most of which it shares with the other Nordic countries: Þ/þ, Ð/ð, Æ/æ, and Ö/ö. (Æ/æ also occurs in Norwegian, Danish and
PLUM keyboard non-letter characters. The extra Function keys F13, F14, and F15 map to Print Screen, Scroll Lock, and the Pause/Break key respectively, although no Scroll Lock light exists. There are also six blank keys surrounding the Arrow keys, which do nothing. It is debatable whether this layout reduces repetitive strain injury, but the general consensus is that while it might prolong it slightly, the QWERTY keyboard might simply aggravate pains without causing the disease, and studies have shown that typists are not any more likely to develop RSI than normal people. Users of PLUM keyboards, however have claimed that after switching