What does iron represent spiritually?
Iron, classically known as the Metal of Mars, has been universally perceived as the symbol of human strength, obstinacy, fortitude, honor, courage, sharpness (of body and mind), tenacity, and confidence in power.
What does the Bible say about iron?
And thy heaven that [is] over thy head shall be brass, and the earth that is under thee [shall be] iron.
Iron is a “special” element because of its nuclear binding energy. The very basic idea is that when you fuse two light elements together, you get a heavier element plus energy. Similarly, if you have a heavy element that undergoes fission and splits into two lighter elements, you also release energy. Down to iron.