or H.S.T., h.s.t.
Example sentences from the Web for hst
This and the subsequent royal decrees will be found in full in Hst's "Struensee's Ministerium," vol.Life and Times of Her Majesty Caroline Matilda, Vol. I (of III)|C. F. Lachelles Wraxall
“Hst,” came the return growl from the other portion of the crowd.
If you want to attract my attention you could just say "Hst!"Alice Sit-By-The-Fire|J. M. Barrie
I whispered to my companion, but she answered by her favourite expression, “Hst!”