Given a travel related situation, and given a specific question about the situation, summarize the question into a title

Let me give you an example: The green carriage is of course first class. This would be our first preference with our 5 month old baby in lap, because of the presumably larger toilets for changing and whatnot. However, the baby being a Western white baby... will occasionally babble, screech or cry uncontrollably for a little while.

Speaking in terms of Japanese culture, should we avoid Green class tickets if we are taking aboard a potentially disruptive baby?

The answer to this example can be: Japanese train etiquette: Is it acceptable to take a baby in the Shinkansen Green Car?
Here is why: A person gives a detailed description about a situation where they would prefer to travel on the Shinkansen Green Car but is doubtful if doing that would be against the Japanese train etiquette since they will be traveling with a baby. The question is summarized as Japanese train etiquette: Is it acceptable to take a baby in the Shinkansen Green Car? for easy indexing the next time someone searches for a similar phrase

OK. solve this:
I see many questions here refer to a US "visa stamp", or "getting a visa stamped" for the US, and I often find it difficult to imagine what is going on with this stamp.

Is it the visa sticker itself that is being referred to as a "stamp"? (This wouldn't be quite as crazy as it sounds -- a postage stamp is a sticker, after all -- but on the other hand such a usage is not evident for any other country's visa stickers).
Or is it the admission stamp in one's passport (showing immigration category and how long a stay one has been granted) that people call a "visa stamp", despite not actually being a visa?
Or do (some classes of?) US visas actually need to have some kind of ink stamp applied to them in order to be valid?

Answer:
What's the deal with "stamping" US visas?