Backwards-L enter key
Provided by the ASK Keyboard Dictionary
Aka/also known as: big-ass enter
A "backwards-L" enter or return key is one that is shaped as described and is usually 2.25 units long and 2 units tall. For IBM and family, a return key very similar to it appeared on US English IBM 3732 Text Display Station Typewriter Keyboards by 1978 but it was not popularised until the emergence of the AT layout in 1984. After the AT layout was supplanted by the Enhanced layout, this style of enter/return key found a new home on the so-called "Asian 10X" layout.