Isaac made a fantastic comment on my facebook feed for this post, so I thought I’d share it with everyone:

"try ゆうびん　to get the 郵便マーク　(〒)
はーと to get ♥ or ♡
おんせん（温泉）to get ♨"

The onsen mark! I’m so jealous I didn’t figure it out myself! It’s such a cool and distinctive mark. I think I’ll blow that shit up: