Nikon D6, Reference Manual

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Adjusting the Camera’s Sensitivity to Light (ISO Sensitivity)
A Hi 0.3–Hi 5
A setting of [ Hi 0.3 ] corresponds to an ISO sensitivity approximately
0.3 EV higher than ISO 102400 (ISO 128000) and [ Hi 5.0 ] to an ISO
sensitivity approximately 5 EV higher (ISO 3280000). Note that pictures
taken at these settings are particularly prone to “noise” in the form of
randomly-spaced bright pixels, fog, or lines.
A
Lo 0.3–Lo 1
[ Lo 0.3 ] corresponds to an ISO sensitivity about 0.3 EV below ISO 100
(equivalent to ISO 80). [ Lo 1.0 ] is roughly 1 EV below ISO 100 (ISO 50). Use
for larger apertures or slower shutter speeds when lighting is bright.
Highlights may be overexposed. In most cases, ISO sensitivities of ISO
[
100 ] or above are recommended.