1. 
   Kronecker delta
   [n] - a function of two variables i and j that equals 1 when i=j and equals 0 otherwise
   Found op http://www.webdictionary.co.uk/definition.php?query=Kronecker%20delta
   
   
2. 
   Kronecker delta
   The function is referred to as an impulse, or unit impulse. And when it stimulates a signal processing element, the output is called the impulse response of the element. ...
   Found op http://en.wikipedia.org/wiki/Kronecker_delta
   
   
3. 
   Kronecker delta
   when you take the integral over all space of a wavefunction and its complex conjugate, you get this. If it is equal to one, the wavefunctions are the same.
   Found op http://www.chemistry-dictionary.com/definition/kronecker+delta.php
   
   

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