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The term X-ray luminosity function and abbreviation XLF is used in a number of types of functions indicating some aspect of X-ray luminosity. It could be used for a typical luminosity function, indicating of the relative number of X-ray sources with each luminosity (analogous to an initial mass function), often for some specified class of X-ray sources such as AGNs, or Milky-Way X-ray-producing stars. One might indicate the luminosity after obscuration by X-ray-opaque material, or the presumed X-ray luminosity behind it. The term could also be used for a function of age or redshift.