This is the 11630th most frequent Russian word.
железо
Iron.
In this sentence, 'железо' refers to the material iron, a commonly used metal.
Это железо нам понадобится для постройки моста.
We will need this iron for building a bridge.
Here, 'железо' represents the element iron as a vital nutrient in the body.
У него в организме низкое содержание железа.
He has a low iron level in his body.
'Железо' is used informally here to mean 'hardware,' referring to the physical components of a computer.