
 Greek numerals  TheBestLinks.com  Ionic numeral system, Astronomer, Arabic numerals, Chinese numerals, ... (Site not responding. Last check: 20071029) 
  In modern Greece, they are still in use for ordinal numbers, and in much the same situations as Roman numerals are in the west; for ordinary numbers, arabic numerals are used. 
  This requires 27 letters, so the 24letter Greek alphabet was extended by using three obsolete letters: digamma (ϝ;, also used are ς or στ) for 6, qoppa (ϟ;) for 90, and sampi (ϡ;) for 900. 
  However, these positions were usually limited to the fractional part of a number (called minutes, seconds, thirds, fourths, etc.), but were not used for their integral part. 
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