history - What's the meaning of the PHP token name T_PAAMAYIM_NEKUDOTAYIM?

What's the story behind the ::'s sometimes token name

T_PAAMAYIM_NEKUDOTAYIM

I'm mainly interested in knowing if

1. This is an abbreviation for something else.


2. This is a phrase in a language other than English, and if so what's the language and what's a rough translation.


3. This is some obscure-to-me programming term.


4. Drunk developers.