높이나 고도, 또는 고지대를 의미하는 'heights'의 약어.
An abbreviation for 'heights', used to refer to the vertical elevation of an object or location.
예문:
"The architectural blueprint specifies the hts of the support beams."
"Use the altimeter to determine the current hts during the climb."
"The survey recorded the hts of all major hills in the region."