不磨 is read as ふま (fuma) and means permanence.
ふま
fuma
せんこふま
permanence
ふまのたいてん
immutable law (esp. the Meiji constitution)
せんざいふま
still remaining after a thousand years
ふきょう
depression
ふかのう
impossible
ふかけつ
indispensable
ふか
failing grade
ふきそく
irregularity
ふじゅん
irregular
ふかい
indisposition
ふかかい
incomprehensible
ふもう
unproductive (e.g. discussion)