Function parameter with type but no ~~symbol~~ identifier?

Using Arduino Programming Questions
1

Recently this surprised me

void myFunction(int OK, int)
{
  Serial.println(OK);
}

void setup()
{
  Serial.begin(115200);

  Serial.print("Hello World ");
  myFunction(42, 777);
}

void loop() {}

It compiles without warning and prints

Hello World 42

So... what is it called so I can google and find out why it flies?

Or 'splain it here if it is simple enough.

a7

2

There's some good discussion of why you'd want to do that to be found here:

3

Perfect, THX.

a7

4

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