Ok. A better, less ephemeral link is https://en.wikipedia.org/wiki/Scope_resolution_operator#PHP .

'T_PAAMAYIM_NEKUDOTAYIM' is the PHP parser's name for the '::' double-colon/scope-resolution-operator token; it means 'T_DOUBLE_COLON' in Hebrew, hence related parser error messages mean "Unexpected double-colon/scope-resolution-operator found". There was some controversy in the PHP community in 2013 about keeping the non-English naming as it was widely considered confusing to users.