Does a signal called "EN" stand for something special in this circuit?

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Homework Statement
Write a boolean expression that describes the function of the circuit below.
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My question is what does "EN" stand for in the circuit?
1702821236064.png

If it is simply a signal like A, B, and C then the function represented by this circuit is ##\bar{(AB+C)EN}##.
 
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Perhaps "enable".
 
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