or H.S.T., h.s.t.
Examples from the Web for hst
Historical Examples of hst
“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
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
I whispered to my companion, but she answered by her favourite expression, “Hst!”