IMac Brightness Icon is displayed on screen and will NOT shut off

Anyone know how to keep the Brightness meter icon from appearing on your screen?
Model Name: iMac
  Model Identifier: iMac12,2
  Processor Name: Intel Core i5
  Processor Speed: 3.1 GHz
  Number of Processors: 1
  Total Number of Cores: 4
  L2 Cache (per Core): 256 KB
  L3 Cache: 6 MB
  Memory: 16 GB
  Boot ROM Version: IM121.0047.B1F
  SMC Version (system): 1.72f2

This is the iPad forum.  For Desktop computer questions please post in the appropriate forum.
iMac (Intel)

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