| 三义 | Sān yì | Sanyi township in Miaoli county 苗栗县, northwest Taiwan |
| 三义乡 | Sān yì xiāng | Sanyi township in Miaoli county 苗栗县, northwest Taiwan |
| 三聚氰胺 | sān jù qíng àn | melamine C3H6N6 |
| 三联书店 | sān lián shū diàn | Joint Publishing Co.,, Hong Kong |
| 三联管 | sān lián guǎn | triplet |
| 三胚层动物 | sān pēi céng dòng wù | triploblastic animals (having three germ layers) |
| 三脚两步 | sān jiǎo liǎng bù | hurriedly; just a few steps away |
| 三膲 | sān jiāo | variant of 三焦, triple foci, the three visceral cavities of traditional Chinese medicine |
| 三自 | sān zì | abbr. for 三自爱国教会, Three-Self Patriotic Movement |
| 三自爱国教会 | sān zì ài guó jiào huì | Three-Self Patriotic Movement, PRC government-sanctioned Protestant church from 1949 |
| 三自教会 | sān zì jiào huì | Three-Self Patriotic Movement, PRC government-sanctioned Protestant church from 1949 |
| 三色 | sān sè | three colors |
| 三色堇 | sān sè jǐn | pansy |
| 三色紫罗兰 | sān sè zǐ luó lán | pansy |
| 三色猫 | sān sè māo | calico cat |
| 三芝 | Sān zhī | Sanchih township in Taipei county 台北县, Taiwan |
| 三芝乡 | Sān zhī xiāng | Sanchih township in Taipei county 台北县, Taiwan |
| 三茶六饭 | sān chá liù fàn | lit. to offer three kinds of tea and six different dishes; to be extremely considerate towards guests (idiom) |
| 三菱 | Sān líng | Mitsubishi |
| 三叶星云 | Sān yè xīng yún | Trifid Nebula M20 |
| 三叶草 | sān yè cǎo | clover; trefoil |
| 三叶虫 | sān yè chóng | trilobite |
| 三藏 | Sān zàng | Tripitaka (602-664) Tang dynasty Buddhist monk and translator, who traveled to India 629-645; same as 玄奘 |
| 三藏法师 | Sān zàng fǎ shī | Tripitaka (602-664) Tang dynasty Buddhist monk and translator, who traveled to India 629-645; same as 玄奘 |
| 三藩之乱 | sān fān zhī luàn | Three feudatories rebellion against Qing 1673-1681 during the reign of Kangxi |
| 三藩叛乱 | Sān fān pàn luàn | rebellion against the Qing of 1670s, pacified by Kangxi |
| 三藩市 | Sān fān shì | San Francisco (California) |
| 三苏 | Sān Sū | the Three Su father and sons; refers to northern Song literati Su Xun 苏洵, Su Shi 苏轼 and Su Zhe 苏辙 |
| 三号木杆 | sān hào mù gān | spoon (golf) |
| 三号电池 | sān hào diàn chí | C size battery (PRC); AA battery (Taiwan); see 二号电池 (C battery in Taiwan) and 五号电池 (AA battery in PRC) |
| 三亲六故 | sān qīn liù gù | old friends and relatives |
| 三角债 | sān jiǎo zhài | chain of debt |
| 三角凳 | sān jiǎo dèng | trestle stool; folding chair |
| 三角座 | sān jiǎo zuò | Triangulum (constellation) |
| 三角恐龙 | sān jiǎo kǒng lóng | triceratops (dinosaur) |
| 三角恋爱 | sān jiǎo liàn ài | love triangle |
| 三角柱体 | sān jiǎo zhù tǐ | triangular prism (math.) |
| 三角法 | sān jiǎo fǎ | trigonometry (math.) |
| 三角测量法 | sān jiǎo cè liáng fǎ | triangulation (surveying) |
| 三角肌 | sān jiǎo jī | deltoid muscle (over the shoulder) |
| 三角腹带 | sān jiǎo fù dài | athletic supporter |
| 三角裤 | sān jiǎo kù | briefs; panties |
| 三角裤衩 | sān jiǎo kù chǎ | briefs; panties |
| 三角锥 | sān jiǎo zhuī | triangular pyramid (math.) |
| 三角关系 | sān jiǎo guān xì | triangle relationship; a love triangle |
| 三角龙 | sān jiǎo lóng | triceratops |
| 三言两句 | sān yán liǎng jù | in a few words (idiom); expressed succinctly |
| 三貂角 | Sān diāo jiǎo | Cape San Diego or Santiao, easternmost point of Taiwan Island |
| 三资企业 | sān zī qǐ yè | foreign, private and joint ventures |
| 三足乌 | sān zú wū | three-legged Golden Crow that lives in the sun (in northeast Asian and Chinese mythology); Korean: samjog'o |
