| Subject | English | Chinese |
| polym. | sigmoidal curve S | 形曲线 |
| desert. | sigmoidal dune | S形沙丘 (指在风速大致相等的反向风作用下形成的一种弯曲沙丘，坡陡、丘脊尖峭) |
| oil | sigmoidal fold | 反曲褶皱 |
| oil | sigmoidal fold | 肠曲褶皱 |
| expl. | sigmoidal grain-size distribution | S型粒度分布 |
| polym. | sigmoidal model S | 形模型 |
| tech. | sigmoidal vein | S 脉型 |