This is the 6106th most frequent Russian word.
сталь
Steel.
In this sentence, 'сталь' is used as a noun referring to the material steel, denoting its composition and quality.
Завод изготовил новое оборудование из высококачественной стали.
The factory produced new equipment from high-quality steel.
Here, 'сталь' is part of a simile comparing a person's strong personality to the resilience of steel, used metaphorically.
Его характер был крепким, как сталь.
His character was strong, like steel.
In this example, 'сталь' metaphorically represents determination and strength, forming part of figurative language.