HelenOS sources
KC_N2 127 uspace/drv/hid/adb-kbd/ctl.c [0x54] = KC_N2,
KC_N2 157 uspace/drv/hid/atkbd/atkbd.c [0x72] = KC_N2,
KC_N2 140 uspace/drv/hid/usbhid/kbd/conv.c [0x5a] = KC_N2,
KC_N2 150 uspace/drv/hid/xtkbd/xtkbd.c [0x50] = KC_N2,
KC_N2 211 uspace/srv/hid/input/ctl/sun.c [0x71] = KC_N2,
KC_N2 191 uspace/srv/hid/input/layout/ar.c [KC_N2] = '2',
KC_N2 220 uspace/srv/hid/input/layout/cz.c [KC_N2] = '2',
KC_N2 199 uspace/srv/hid/input/layout/fr_azerty.c [KC_N2] = '2',
KC_N2 200 uspace/srv/hid/input/layout/us_dvorak.c [KC_N2] = '2',
KC_N2 194 uspace/srv/hid/input/layout/us_qwerty.c [KC_N2] = '2',
HelenOS homepage, sources at GitHub