1. 
   rep-unit
   A number whose digits are all units; the rep-unit (repeated unit) with n digits is denoted R_n. For example, R₁=1, R₂=11, R₃=111, and R_n=(10ⁿ - 1)/9. R_n...
   Found op http://www.daviddarling.info/encyclopedia/R/rep-unit.html
   
   
2. 
   Repeat unit
   An essential concept which defines polymer structure, the repeat unit or repeating unit is a part of a polymer chain whose repetition would produce the complete polymer (except for the ends) by linking the repeat units together successively along the chain, like the beads of a necklace. A repeat un...
   Found op http://en.wikipedia.org/wiki/Repeat_unit
   
   
3. 
   repeating unit
   (from the article `industrial polymers, major`) In this article, the major commercially employed polymers are divided by the composition of their `backbones,` the chains of linked repeating units ...
   Found op http://www.britannica.com/eb/a-z/r/34
   
   
4. 
   representation unit
   minimum difference between two successive output states
   Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=314-02-11
   
   
5. 
   Repunit
   In recreational mathematics, a repunit is a number like 11, 111, or 1111 that contains only the digit 1. The term stands for repeated unit and was coined in 1966 by Albert H. Beiler. A repunit prime is a repunit that is also a prime number. == Definition == == Properties == == Factorization of deci...
   Found op http://en.wikipedia.org/wiki/Repunit
   
   

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