(Image borrowed from Pink Tentacle)
Pink Tentacle has posted a link of town symbols based upon kanji. The one above is from Tenri city in Nara prefecture. Can you see the kanji 天? And perhaps the circle represents the kanrodai at ojiba at the headquarters of the religion Tenrikyo.
Check out more town symbols:
At the end of the post is a link to their post on town symbols based upon hiragana and katakana.