double prime
noun [ U ] uk/ˌdʌb.əl ˈpraɪm/ us/ˌdʌb.əl ˈpraɪm/
（表示英寸等的）双撇号 ('')
the symbol ( '' ) used, for example, to represent inches in measurements
Single prime denotes feet and double prime denotes inches. 单撇号表示英尺，双撇号表示英寸。
Double prime and quotation mark tend to get used interchangeably in our digital world. 在我们的数字世界中，双撇号和引号往往交替使用。
- More examples
- Just as there's a special character for a degree symbol, there are also special characters for prime and double prime symbols.
- The double prime over the summation indicates that the first and last terms are to be multiplied by 1.