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: