This is correct for the context you described. There are other things you could say, of course, but "What does this mean?" is perfectly fine for the situation. 🚩 "What is this meaning?" On the other hand, while this is technically valid and grammatical English (AmE), it's meaning is actually very different than your intention.
What does "by" mean if we are talking about a date? Ask Question Asked 10 years ago Modified 5 years, 3 months ago
Cal Alumni Association: What Does It Mean to Love Your Country Today?
Popular Science: What does ‘chance of precipitation’ really mean? A meteorologist explains.
PBS: What does R. Kelly's alleged culture of abuse suggest about how society views black women?
What does R. Kelly's alleged culture of abuse suggest about how society views black women?
When you ask How much does it cost to [x], you're simply asking for information. You could be asking out of pure curiosity, or because you want to purchase the item in question, but no implication is made either way. When you ask How much would it cost to [x], there is a stronger implication that you're wanting to buy the item you're discussing.
auxiliary verbs - When to use "does" and when to use "would"? - English ...
When do I use is or does when I ask a question? For example, Is your item still for sale? Does your item still for sale? I am not sure which one to use.
(I assume you mean "Does this belong to you?" You can't use is because do is the auxiliary verb we use when forming questions. From the Cambridge Grammar website: Do is one of three auxiliary verbs in English: be, do, have. We use do to make negatives (do + not), to make question forms, and to make the verb more emphatic.