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- 偽投射左S-系Pseudo-projective left S-acts
- 所有強平坦左S-系是正則系的幺半群Monoid over which all strongly flat left S acts are regular
- 左left
- 左對齊flush left
- 中文系department of Chinese language and literature
- 全系holophyly
- 證偽falsification
- 左的sinistral
- 報系syndicate
- 色系colour system
- 在左left
- 偽詞源(學(xué))false etymology
- 左舷port
- 大陸法系Continental Legal System
- 左下的bottom-left
- 白堊系cretaceous
- 左前left anterior
- 第四系quaternary system
- 左上方top-left
- 拓撲群的投射系Projective system of topological groups
