This is a bit of an ad hoc question, but still should be well within the scope of JLU, so here goes: While trying to come up with ideas for our new logo in the meta group (subliminal message: go and ...
The ヶ in e.g. 一ヶ月 is a bit of an odd character - it looks a lot like a small version of the katakana ケ, but is it derived from that katakana originally? Or is it a normal kanji? Or is it something ...