Hibachi's a personal charcoal heater, sometimes used in times of strife (like war) to heat food too. It's kind of similar to a charcoal grill, or the Japanese version of that, which is called a Shichirin.
If people are thinking of a steel plate, that's Teppanyaki, cooked on a steel surface, or Teppan.
It's 2023 people, no reason to be ignorant about "foreign" countries anymore. Japanese is practically the world's official Asian language due to Anime and Manga, video games, etc. which is highly ironic given the aims of Imperial / Fascist Japan and the absolutely wrongheaded way they were going about it.