铁板 (tiě bǎn) literally means 'iron plate' — a flat, rigid sheet made of iron or steel. The character 铁 (tiě) means 'iron', and 板 (bǎn) means 'board' or 'plate', together forming a compound noun referring to a solid metal slab used in construction, machinery, cooking equipment, or signage. It is commonly found in industrial, culinary, and architectural contexts.

In everyday usage, 铁板 appears in phrases like 铁板烧 (tiě bǎn shāo), a Japanese-style grilled dish cooked on a hot iron plate, and 铁板钉钉 (tiě bǎn dìng dīng), an idiom meaning 'as certain as nails hammered into an iron plate' — indicating something absolutely settled or unchangeable. Though it can refer to literal metal sheets, its figurative use in idioms is especially frequent in spoken and written Mandarin.