剛 - sturdy, strength

vigour; vigor; virility; health; sturdiness

being tough on the outside but soft at heart; a faint-hearted person pretending to be brave

Diamond Sutra

Diamond Wisdom Sutra; Diamond Sutra

Diamond Perfection of Wisdom Sutra; Diamond Sutra

soft and fair goes far; willows are weak, yet they bind other wood

Goju-ryu (karate school)

unparalleled for valor; unmatched for bravery

vajra (mystical weapon in Hinduism and Buddhism)

strength; firmness

bravery and cowardice

bristle; seta; stiff hair; coarse hair