| 三民 | Sān mín | Sanmin district of Kaohsiung city 高雄市, south Taiwan |
| 三民区 | Sān mín qū | Sanmin district of Kaohsiung city 高雄市, south Taiwan |
| 三民乡 | Sān mín xiāng | Sanmin district of Kaohsiung city 高雄市, south Taiwan |
| 三氟化硼 | sān fú huà péng | boron trifluoride |
| 三氯化磷 | sān lǜ huà lín | phosphorous trichloride |
| 三氯化铁 | sān lǜ huà tiě | ferric chloride FeCl3 |
| 三氯已烯 | sān lǜ yǐ xī | trichloroethylene |
| 三氯已烷 | sān lǜ yǐ wán | trichloroethane |
| 三氯氧磷 | sān lǜ yǎng lín | phosphorous oxychloride |
| 三氯甲烷 | sān lǜ jiǎ wán | chloroform CHCl3; trichloromethane |
| 三水区 | Sān shuǐ qū | Sanshui district of Foshan city 佛山市, Guangdong |
| 三水县 | Sān shuǐ xiàn | Sanshui county in Guangdong |
| 三江并流 | Sān jiāng bìng liú | Three Parallel Rivers National Park, in mountainous northwest Yunnan World Heritage protected area: the three rivers are Nujian 怒江 or Salween, Jinsha 金沙江 or upper reaches of Changjiang and Lancang 澜沧江 or Mekong |
| 三江侗族自治县 | Sān jiāng dòng zú zì zhì xiàn | Sanjiang Dong autonomous county in Liuzhou 柳州, Guangxi |
| 三江平原 | Sān jiāng píng yuán | Sanjiang or Three rivers plain in Heilongjiang, vast wetland watered by Heilongjiang 黑龙江 or Amur, Songhua 松花江, Ussuri 乌苏里江 |
| 三江源 | Sān jiāng yuán | Sanjiangyuan National Nature Reserve, high plateau region of Qinghai containing the headwaters of Changjiang or Yangtze, Huanghe or Yellow River and Lancang or Mekong River |
| 三江生态旅游区 | Sān jiāng shēng tài lǚ yóu qū | Sanjiang ecological tourist area in Wenchuan county 汶川县, northwest Sichuan |
| 三河 | Sān hé | Three rivers; Sanhe county level city in Langfang 廊坊, Hebei |
| 三河市 | Sān hé shì | Sanhe county level city in Langfang 廊坊, Hebei |
| 三河县 | Sān hé xiàn | Sanhe county in Beijing |
| 三法司 | sān fǎ sī | Three judicial chief ministries in imperial China |
| 三洋 | sān yáng | Sanyō, Japanese electronics company |
| 三浦梅园 | Sān pǔ Méi yuán | MIURA Baien (1723-1789), Japanese neo-Confucian philosopher and pioneer economist, author of The Origin of value 价原 |
| 三温暖 | sān wēn nuǎn | sauna (Taiwan) |
| 三湾 | Sān wān | Sanwan township in Miaoli county 苗栗县, northwest Taiwan |
| 三湾乡 | Sān wān xiāng | Sanwan township in Miaoli county 苗栗县, northwest Taiwan |
| 三焦 | sān jiāo | triple foci, the three visceral cavities of traditional Chinese medicine |
| 三用表 | sān yòng biǎo | instrument console (diving) |
| 三田 | sān tián | 3 annual hunting bouts; 3 qi points; Mita, Sanda, Mitsuda etc (Japanese surname or place name) |
| 三略 | Sān Lüè | see "Three Strategies of Huang Shigong" 黄石公三略[Huang2 Shi2 gong1 San1 Lu:e4] |
| 三叠纪 | Sān dié jì | Triassic (geological period 250-205m years ago) |
| 三皇 | sān huáng | Three Sovereigns, between Gods and Emperors in third millennium BC; usually listed as Suiren 燧人, Fuxi 伏羲,trapping and writing, Shennong or Farmer God 神农 |
| 三皇五帝 | sān huáng wǔ dì | three sovereigns 三皇 and five emperors 五帝 of myth and legend; the earliest system of Chinese historiography |
| 三皇炮捶 | sān huáng pào chuí | Paochui - "Three Emperor Cannon Punch" (Chinese Martial Art) |
| 三硝基甲苯 | sān xiāo jī jiǎ běn | trinitrotoluene (TNT) |
| 三碳糖 | sān tàn táng | triose (CH20)3, monosaccharide with three carbon atoms, such as glyceraldehyde 甘油醛 |
| 三磷酸腺苷 | sān lín suān xiàn gān | adenosine triphosphate (ATP) |
| 三棱草 | sān léng cǎo | sedge herb (Cyperus rotundus) |
| 三穗 | Sān suì | Sansui county in Qiandongnan Miao and Dong autonomous prefecture 黔东南州, Guizhou |
| 三穗县 | Sān suì xiàn | Sansui county in Qiandongnan Miao and Dong autonomous prefecture 黔东南州, Guizhou |
| 三等分 | sān děng fēn | trisection (math.); trisecting an angle |
| 三等分角 | sān děng fēn jiǎo | trisection (math.); trisecting an angle |
| 三级 | sān jí | grade 3; third class; category C |
| 三级士官 | sān jí shì guān | staff sergeant |
| 三级片 | sān jí piàn | third category movie (containing sexual or violent content) |
| 三级跳 | sān jí tiào | triple jump (athletics); hop, skip and jump |
| 三级跳远 | sān jí tiào yuǎn | triple jump (athletics); hop, skip and jump |
| 三索锦蛇 | sān suǒ jǐn shé | copperhead race (Elaphe radiata), kind of snake |
| 三维 | sān wéi | three dimensional; 3D |
| 三维空间 | sān wéi kōng jiān | three-dimensional space; 3D |
