The Shanghai Interbank Offered Rate (or Shibor, 上海银行间同业拆放利率) is a daily reference rate based on the interest rates at which banks offer to lend unsecured funds to other banks in the Shanghai wholesale (or "interbank") money market. There are eight Shibor rates, with maturities ranging from overnight to a year. They are calculated from rates quoted by 18 banks, eliminating the two highest and the two lowest rates, and then averaging the remaining 14.
References
Shanghai Interbank Offered Rate Wikipedia(Text) CC BY-SA