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Form factor may refer to:

• Form factor (radiative transfer) or emissivity, the proportion of energy transmitted by that object which can be transferred to another object
• Form factor (electronics), an alternating current waveform
• Electric form factor, the Fourier transform of electric charge distribution in space
• Magnetic form factor, the Fourier transform of an electric current distribution in space
• Atomic form factor, or atomic scattering factor, is a measure of the amplitude of a wave scattered from an isolated atom
• A standard size and shape of computer subsystem, including:
  • Motherboard form factor, the size and shape of a computer's motherboard, which sets a lower limit on the overall size and shape of the computer
  • Disk enclosure form factor

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