In the IBM PC-AT, what do the words AT stand for __________?

In the IBM PC-AT, what do the words AT stand for __________?

Explanation

In the IBM PC-AT, AT stands for advanced technology.

The IBM Personal Computer AT, more commonly known as the IBM AT

IBM's second-generation PC,

it designed around the 6 MHz Intel 80286 microprocessor 

it was released in 1984 as System Unit 5170.