| 老三篇 | lǎo sān piān | Lao San Pian, three short essays written by Mao Zedong before the PRC was established |
| 肱三头肌 | gōng sān tóu jī | triceps brachii (back of the upper arm) |
| 腺嘌呤核甘三磷酸 | xiàn piào lìng hé gān sān lín suān | Adenosine triphosphate (ATP) |
| 举一反三 | jǔ yī fǎn sān | to raise one and infer three; to deduce many things from one case (idiom) |
| 莱齐耶三世 | Lái qí yē Sān shì | Letsie III of Lesotho |
| 着三不着两 | zháo sān bù zháo liǎng | scatter-brained; thoughtless |
| 西三条 | xī sān tiáo | Xisantiao (Beijing placename) |
| 话到嘴边留三分 | huà dào zuǐ biān liú sān fēn | a still tongue makes a wise head (idiom) |
| 调三窝四 | tiáo sān wō sì | to sow the seeds of discord everywhere (idiom) |
| 货比三家 | huò bǐ sān jiā | to comparison shop (idiom); comparison shopping |
| 退避三舍 | tuì bì sān shè | lit. to retreat three day's march (idiom); fig. to give way in the face of superior strength; a strategic withdrawal |
| 连三并四 | lián sān bìng sì | one after the other; in succession (idiom) |
| 周三 | zhōu sān | Wednesday |
| 金三角 | Jīn sān jiǎo | Golden Triangle (Southeast Asia) |
| 金泳三 | Jīn Yǒng sān | Kim Young-sam (1927-), South Korean politician, president 1993-1998 |
| 钱三强 | Qián Sān qiáng | Qian Sanqiang |
| 长三角经济区 | Cháng sān jiǎo jīng jì qū | Yangtze River Delta Economic Zone (economic region including Shanghai, Zhejiang and Jiangsu) |
| 长江三角洲经济区 | Cháng jiāng sān jiǎo zhōu jīng jì qū | Yangtze River Delta Economic Zone (economic region including Shanghai, Zhejiang and Jiangsu) |
| 开三次方 | kāi sān cì fāng | cube root; to extract a cube root |
| 陆海空三军 | lù hǎi kōng sān jūn | army, navy, air force |
| 隔三差五 | gé sān chà wǔ | every now and then (idiom) |
| 雌三醇 | cí sān chún | estriol |
| 颠三倒四 | diān sān dǎo sì | confused; disorderly; incoherent |
| 马三立 | Mǎ Sān lì | Ma Sanli |
| 黄石公三略 | Huáng Shí gōng Sān Lüè | ”Three Strategies of Huang Shigong”, also known as Taigong Bing Fa 太公兵法, one of the Seven Military Classics of ancient China 武经七书, variously attributed to Jiang Ziya 姜子牙, Huang Shigong 黄石公 or an anonymous author |
| 丢三落四 | diū sān là sì | forgetful; scatterbrained |
