The name Unit is used in Foundation for that exact meaning:
https://developer.apple.com/documentation/foundation/unit
<https://developer.apple.com/documentation/foundation/unit>.
I like the name `Nothing` for the empty tuple. func foo(Nothing) {}
> On Jun 12, 2017, at 1:57 PM, David Sweeris via swift-evolution
> <swift-evolution@swift.org> wrote:
>
>
> On Jun 12, 2017, at 10:44, Jérémie Girault via swift-evolution
> <swift-evolution@swift.org <mailto:swift-evolution@swift.org>> wrote:
>
>> Void was the empty tuple because arguments were tuples. So no arguments
>> meant empty tuple.
>>
>> If we consider the empty tuple to be an argument, then the type for the type
>> of empty tuple should be `Unit`
>>
>> Void, however, seem naturally fitted for the absence of argument.
>>
>> Should `func foo(Void)` be different from `func foo()`? I don’t think so.
>> But different from `func foo(Unit)` ? Yes !
>>
> To me, "Unit" is used like "a unit of length", "a unit of time", etc. I've
> not come across it being used as analog for something like the empty tuple.
>
> - Dave Sweeris
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