シフトキー
A key at E00 is not required, but when it is present on the keyboard, the positions E13 and B00 (shown in red) may have no key (e. g. the US layout with the Backspace or Delete key at E14 enlarged to E13 and the left Shift key at B99 enlarged to B00); but most international layouts having a key at E00 also have at least one key on E13 (with a narrow Backspace or Delete key on row E at E14, but a left Shift key at B99 enlarged to B00) or B00 (with a narrow left Shift key at B99, but a Backspace or Delete key at E14 enlarged to E13). Key at E00 may also be used to allocate a function key (notably the Escape key on compact keyboards), in which case a key will generally be present at E13 (on compact US layout), or B00, or both (on compact international layouts). Finally the key at E00 may also be used to place the digit 0 at start of the row instead of the more common location at E10, in which case there two positions E13 and B00 may be used to enlarge both the Backspace or Delete key at E14 to E13 and the left Shift Key at B99 to B00).