Interested in Language
what are the differences between these two sentences?
"what are XX and XX mean?"
"What do XX and XX mean?"
The first sentence is ungrammatical. It would have to say, "What are XX and XX meaning?", but we don't normally use the verb "to mean" in the present continuous (or present progressive, as it's sometimes called) -- so the sentence is completely wrong.
The second sentence is perfectly OK. It's the normal way to construct a question using the present simple: Question word (what), do or does, subject (XX and XX), main verb (mean). The answer might start with: "They mean that..."