Here is a のれん (Japanese doorway curtain) with a symbol that is commonly seen and easily understood in Japan. 
But, how about outside of Japan? What would you assume that symbol means? What do you think this curtain is the entrance to?
***edit 2015 June 13th***
As of June 13, 2015, most people (by a wide margin) chose “Hot Spring” as the meaning of the ♨ symbol…and that’s correct!
I guess this poll was too easy. I’ll try to make the next one a bit more difficult.
Thank you to everyone who participated in the poll.
Tokyo Five 
I edited this post with the correct answer…which is “Hot spring”.
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I figured onsen.
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Haven’t you seen that symbol around when you visited Japan?
Certainly your mother knows it!
😉
Anyways, I’ll tell the answer soon!
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It says yu. Isn’t that hot water?
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Yes, that’s right!
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I also voted hot spring, but only because it looks like that in my eyes. I do hope it is not the restroom!! 🙂
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Thanks for taking the poll. I’ll put the correct answer soon.
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I would think hot spring but that seems too obvious.
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Did you choose that in the poll? I’ll tell the answer soon.
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I did.
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Thanks.
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