Which term corresponds to 'jack' in English?

The term that corresponds to 'jack' in English is usually associated with a device used for lifting, which is reflected in the term "Heber" in German. This term is commonly used in contexts involving lifting machinery, such as car jacks or hydraulic jacks, which are designed to raise heavy loads safely and efficiently.

In contrast, the other terms do not align with this specific meaning. "Gelenk" translates to 'joint,' typically used in anatomical or mechanical contexts to refer to the point where two parts meet. "Schicht" means 'layer' and is often used in geological or structural contexts to denote different strata or levels. "Blei" translates to 'lead,' which refers to the chemical element rather than a lifting device. Therefore, "Heber" is the most accurate choice reflecting the meaning of 'jack' as it relates to a lifting mechanism.