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)

跆拳道: taekwondo

this school / the main school, the head school

core of the issue / this article

鉄: iron (metal)

哲: a male given name

哲也: a male given name / 徹也: a male given name / 鉄也: a male given name / 哲哉: a male given name / 徹哉: a male given name

哲司, 鉄治, 哲二, 哲志: a male given name

哲夫, 哲男, 哲朗, 哲雄, 哲緒, 鉄男, 鉄雄, 鉄緒: a male given name / 徹男, 徹雄, 徹緒, 哲生: a male given name

鉄人: a male given name / 徹登: a male given name