appositive

Otherwise appositives should be set off with commas, when the appositive is critical to the narrative, or parentheses (for when it isn't).

Emdashes are useful for an embedded appositive phrase, which a colon can't handle the same way.

I had to google what an appositive was) but was not sure if I successfully used it correctly.

I agree completely, but the original sentence used a policeman as a member of the list, not an appositive.

Original title did not specify the company involved, so I added it as an appositive for clarity.

Commas are the most common way to set off an appositive phrases but most sources say that em dashes and parenthesis are also acceptable.

The use of an appositive phrase alone would raise alarm bells though.

At least put a subtitle or appositive clause on the title.

That's not a particularly good example, since you have the same ambiguity between the use of commas to set off non-restrictive appositives and the use of commas to separate list items, it still occurs in lists where the ambiguity is between four (or more) elements with no appositive or three (or more) elements, one of which has a non-restrictive appositive attached.

This obviously leaves open the handling of non-appositive parentheticals.

In every counterexample that I have seen the ambiguity involves an appositive phrase set off by commas which is lurking nearby in the sentence.

The BrietBlart-class right wing news media loves to make a big deal out of a hardly noticeable editorial mistake like the incorrect tense in an unimportant double-appositive clause.

To follow the same analogy, it's like learning enough English to be conversational and get around America, without knowing what an "appositive" is.

Eliding the "being" appositive, you're left with > [Noun], [sentence].

"NSA Spying" is appositive speech; it's perfectly normal and understood.

For example, in this case we could just as well be looking at an appositive[1], making the sentence a perfectly well-formed answer to, say, the question "Who's the main character?" 1.

Appositive comma, or missing Harvard comma?