Omission of "and" in headlines

What is this phenomenon called?

Is it common in all English-speaking countries?

Solution 1:

The omission of conjunctions is officially called asyndeton. Greek deo = "to tie, to bind" (just like Latin iungo in conjunction); syn = "together (with)"; a = "non-". A syndeton is a conjunction; asyndeton is "non-conjunction". That is what the omission of conjunctions for rhetorical effect or otherwise has been called since Antiquity.

I believe it is quite common in most European languages, both in headlines for brevity and in literature as a figure of speech. It can also be a natural and quite neutral feature of ordinary texts, with hardly any special effect. You will find it in speech as well.

Solution 2:

Headlines, like speech, tweets, and book titles, are often not made of full, grammatical sentences. It's a method of saving space while retaining readability; the "and" is usually replaced by a comma, as in "Site Answers Questions about Cooking, English, Gaming".