1. 
   Cryptarithm
   A number puzzle in which an indicated arithmetical operation has some or all of its digits replaced by letters or symbols and where the restoration of the original digits is required. Each letter represents a unique digit.
   Found op http://www.diracdelta.co.uk/science/source/c/r/cryptarithm/source.html
   
   
2. 
   cryptarithm
   (from the article `number game`) The term `crypt-arithmetic` was introduced in 1931, when the following multiplication problem appeared in the Belgian journal Sphinx:
   Found op http://www.britannica.com/eb/a-z/c/164
   
   
3. 
   cryptarithm
   A number puzzle in which a group of arithmetical operations has some or all of its digits replaced by letters or symbols, and where the original digits must be found. In such a puzzle, each letter or symbol represents a unique digit. The first example appeared in American Agriculturist in 1864. Spec...
   Found op http://www.daviddarling.info/encyclopedia/C/cryptarithm.html
   
   

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