a single noun without articles or determiners

This just in:
Headline Style Allows Single Noun without Article

BarbaraPAThis just in:Headline Style Allows Single Noun without Article

Also captions under photographs:

'Boy with dog.'

'Man on beach.'

And in notes or memos:

'Custodian to lock door of office at 10pm.'

If I may cheat, too: In this sentence, "cat" is a singular count noun used without a determiner.

Tarzan not need determiner. Tarzan not know what article is.

CliveMan is the dominant species on the planet. (Or am I cheating?)

Thanks. I think I got your point, but would you please explain how should I use it?
I understand that the sentence is correct, but I always hesitate to use that style. For instance, I would use 'The man'.
Similarly, "Student is a person who studies." is a crossroad for me. I don't know

Aspara GusIf I may cheat, too: In this sentence, "cat" is a singular count noun used without a determiner.

Thank you for your answer, but I have no idea, what are you talking about! What do you two mean from cheating? And what the "cat" is referring to? I don't see any cat anywhere.

Every time I say never, somebody comes along with a counter-example and makes a monkey out of me. I think that's why nobody wants to say there is no such situation. (Clive was cheating, as he hinted.) I will say that in ordinary writing, you cannot have a singular countable noun with no determiner or article, no. Headlines, captions, reported illiterate speech, yes.