- 含沙射影 hánshāshèyǐng to attack by innuendoto attack or slander someone by making subtle or indirect hints; to make insinuations. Literally refers to a legendary creature that could spit sand at a person's shadow to cause them harm.
- 射影几何 shèyǐngjǐhé projective geometrythe branch of mathematics concerned with the properties of geometric figures that are invariant under projection
- 射影几何学 shèyǐngjǐhéxué projective geometrythe branch of mathematics that studies the properties of geometric figures that are invariant under projection
- 射影变换 shèyǐngbiànhuàn projective transformationa transformation in projective geometry that maps lines to lines
