Board Thread:Naruto Discussions/@comment-26320097-20150423120614/@comment-3965545-20150426180711

Umm it is the Uzumaki symbol, Kushina says so in the chapter she meets Naruto. It's a symbol of the everlasting friendship between Hidden Eddie and Konoha even after Eddie Villages destruction.

@Seelentau So that confirms that at the very least its been 12 years 9 months(9 months pregnancy counts) since Naruto and Hinata married?