Enter key
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On computer keyboards, the enter key ⌅ Enter and return key ↵ Return are two closely related keys with overlapping and distinct functions dependent on operating system and application.
An example of a non-standard double-height ANSI return key on the NeXTstation keyboard (alongside several other non-standard elements)
Apple Pro keyboard, showing symbols on the return key and, on the number pad, the enter key
The Commodore 64 (released in 1982) had only the "return" key.
IBM PC keyboard
Videos
The keyboard for IBM PC-compatible computers is standardized. However, during the more than 30 years of PC architecture being frequently updated, many keyboard layout variations have been developed.
Image: Brazilian 104 key ABNT2 keyboard
Image: Brazilian 107 key ABNT2 Windows keyboard