Examples from the Web for hh
The numbers 88 and 14 are signifiant in neo-Nazi culture: “H” is the 8th letter of the alphabet; “HH” stands for “Heil Hitler.”
As soon as you find you can gradate tolerably with the pen, take an H. or HH.The Crown of Wild Olive|John Ruskin
If the level descends as far as to the orifice in the partition, hh', the gas will flow out without causing the apparatus to move.
Page 156 and he would have borrowed a hh of corne of ye Indeans, hh is probably hogshead.Bradford's History of 'Plimoth Plantation'|William Bradford
A little further back there were constructed two cabins, G and HH.
An "HH" pencil for instance, might do, but the imprint would be hardly visible on the palm.Indian Conjuring|L. H. Branson