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- Smarandache二重阶乘函数the Smarandache double-factorial function
- 二two
- 不完全阶乘函数incomplete factorial function
- F.Smarandache可乘函数F. Smarandache multiplicative function
- 二重dualism
- 阶乘factorial
- Smarandache可乘函数Smarandache multiplicative function
- 二重积分double integration
- 最小二乘函数least-squares functional
- 二重螺旋轴screw diad
- 二重转动轴rotation diad
- 动态最小二乘函数dynamic least squares function
- 二重的duplicate
- 二重染色duplicate stained
- 二重组织backed weave
- 二重淬火double quenching
- 二重分类classification by dichotomy
- 型二重态lambda type doublet
- 半二重half duplex
- 二重锯dial
