high temperature, high heat

white heat / (figuratively) becoming heated (impassioned)

to emit white heat / (figuratively) to become heated (impassioned)

(archaic) iron / (figuratively) something extremely strong

iron

iron, the metal and the metallic chemical element / (more generally) steel / short for 鉄砲 (teppō, literally “cannon”, but in this case, refers to the poisonous fugu blowfish or dishes made from it)

incandescent light bulb

(metallurgy) galvanized iron

(music) glockenspiel

(weaponry) a caltrop