ATOP
Meaning of ATOP in English
I. ə-ˈtäp adverb or adjective
Date: 1650
: on, to, or at the top
II. preposition
Date: 1655
: on top of
Merriam-Webster's Collegiate English vocabulary.
Энциклопедический словарь английского языка Merriam Webster.
2003