It's got to be 忍 if it's 'blade and heart'. You must remember this kanji because it's the 'nin' part of everyone's favorite word 'Ninja '=忍者.
As JimmySeal says, this kanji means 'to bear silently' as a verb (忍ぶ = shinobu), which is why ninjas are also often called 'Shinobi'.
By the way, the kanji for the animal bear is 熊 (くま) so it couldn't be what jmwintenn was looking for.
As JimmySeal says, this kanji means 'to bear silently' as a verb (忍ぶ = shinobu), which is why ninjas are also often called 'Shinobi'.
By the way, the kanji for the animal bear is 熊 (くま) so it couldn't be what jmwintenn was looking for.