- In archaeology, a core is a distinctive artifact that results from the practice of lithic reduction. In this sense, a core is the scarred nucleus resulting from the detachment of one or more lithic flakes from a lump of source material or tool stone, usually by using a hard hammer percussor such as a hammerstone.
- In astrophysics, the core of a star is its center where nuclear fusion takes place. In astrophysics and geology, a planetary core is the composite material at the centre of a planet.
- In biology, the core of a fruit contains its seeds.
- In computing:
- In construction, when the force in an element is within a certain center section, the core, the element will only be under compression.
- In economics, the core is a feasible allocation in an economy that cannot be improved upon by any coalition of consumers.
- In mathematics, the core of a group is an object appearing in group theory.
- In a nuclear reactor, the core is the portion containing the fuel components.
- In planetary science, the core of a planet contains its innermost layer(s). Due to planetary differentiation, such layers tend to be more dense than outer layers.
- In telecommunication:
- The central region about the longitudinal axis of an optical fiber, which region supports guiding of the optical signal.
- A piece of ferromagnetic material, usually toroidal in shape, used as a component in a computer core memory device or transformers.
- The material at the center of an electromechanical relay or solenoid, about which the coil is wound.
- In injection moulding, the core is the solid part of the mould that helps shape the plastic material injected.
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