I just noticed that Shiba Kuukaku has this tattoo on her left arm
Bleach 79 page 19 | One Manga
Kurosaki Isshin has the plate thing on his left arm (in roughly the same place)
Bleach 187 page 10 | One Manga
Bleach 187 page 12-13 | One Manga
Could this be because Isshin carries the Crest of the Head of the Shiba Clan.
However, because he took it with him she got a tattoo of it to signify she is the new Head
Please note that his plate thing is cracked so the writing that I believe is the same as the tattoo faded.
Does anyone know what that tattoo stands for?