WLS

WLS is a three-letter abbreviation with multiple meanings, as described below:

The base callsign of two broadcast stations in Chicago, Illinois:
*WLS (AM), the radio station at 890 kHz
*WLS-TV, the TV station on analog channel 7 and digital channel 52
*WLS-FM on 94.7 is now WZZN
* Both callsigns date back to when Sears, Roebuck and Company owned both stations, and stood for: Worlds Largest Store.
Weight loss surgery: see Roux-en-Y gastric bypass surgery.
Weighted least squares, in computer science, is a method for model fitting.

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