In radio astronomy, the unit flik was coined by a group at Lockheed in Palo Alto, California as a substitute for the SI derived unit W cm-2 sr-1 µm-1, or watts divided by centimeters squared, steradians, and micrometers.

This is primarily used as a unit of spectral radiance or sterance. While it started out used only in Lockheed, many in the radio astronomy field adopted its use.

Flik is also a character from the Disney/Pixar movie A Bug's Life.

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