- 长三角 Cháng Sānjiǎo Yangtze River DeltaYangtze River Delta (abbr. for [[长江三角洲|長江三角洲|Chang2 Jiang1 San1 jiao3 zhou1]])
- 三角形 sānjiǎoxíng triangle
- 三角洲 sānjiǎozhōu deltadelta (geography)
- 珠江三角洲 Zhūjiāng Sānjiǎozhōu Pearl River DeltaPearl River Delta (PRD)
- 长江三角洲 Cháng Jiāng Sānjiǎozhōu Yangtze River Deltathe Yangtze River Delta
- 金三角 Jīnsānjiǎo Golden TriangleGolden Triangle (Southeast Asia)
- 三角债 sānjiǎozhài triangular debt
- 三角函数 sānjiǎohánshù trigonometric function
- 三角裤 sānjiǎokù briefstriangular-shaped undergarments for men or women, including briefs and panties
- 三角肌 sānjiǎojī deltoiddeltoid muscle (over the shoulder)
- 直角三角形 zhíjiǎosānjiǎoxíng right triangleright-angled triangle
- 三角恋爱 sānjiǎoliàn'ài love triangle
- 三角板 sānjiǎobǎn set squareA drafting tool, typically a right-angled triangular template, used for drawing geometric shapes and precise angles.
- 三角带 sānjiǎodài v-beltV-belt (a type of drive belt with a trapezoidal cross-section)
- 百慕大三角 Bǎimùdàsānjiǎo Bermuda Triangle
- 三角铁 sānjiǎotiě angle ironan L-shaped metal bar used in construction and structural support
- 三角法 sānjiǎofǎ trigonometrytrigonometry (math.)
- 三角学 sānjiǎoxué trigonometry
- 湄公河三角洲 Méigōnghé Sānjiǎozhōu Mekong River Delta
- 长江三角洲经济区 Chángjiāng Sānjiǎozhōu Jīngjì Qū Yangtze Delta ZoneYangtze River Delta Economic Zone (economic region including Shanghai, Zhejiang and Jiangsu)
- 抚远三角洲 Fǔyuǎnsānjiǎozhōu Bolshoi Ussuriisk IslandAn island at the confluence of the Heilongjiang (Amur) and Ussuri rivers, also known as Heixiazi Island.
- 三角座 Sānjiǎozuò TriangulumTriangulum (constellation)
- 等边三角形 děngbiānsānjiǎoxíng equilateral triangle
- 三角关系 sānjiǎoguānxì love triangletriangular relationship, especially a love triangle
- 三角凳 sānjiǎodèng three-legged stool
- 三角巾 sānjiǎojīn slingsling (for a wounded arm)
- 三角恐龙 sānjiǎokǒnglóng triceratopstriceratops (dinosaur)
- 三角旗 sānjiǎoqí pennanttriangular flag; pennant
- 三角柱体 sānjiǎozhùtǐ triangular prismtriangular prism (mathematics)
- 三角测量法 sānjiǎocèliángfǎ triangulationtriangulation (surveying)
- 三角腹带 sānjiǎofùdài jockstrapathletic supporter
- 三角裤衩 sānjiǎokùchǎ briefsUnderwear with a triangular cut, including both men's briefs and women's panties.
- 三角锥 sānjiǎozhuī triangular pyramidtriangular pyramid (math.)
- 三角龙 sānjiǎolóng triceratops
- 不等边三角形 bùděngbiānsānjiǎoxíng scalene triangle
- 不规则三角形 bùguīzésānjiǎoxíng scalene trianglescalene triangle (math.)
- 南三角座 Nánsānjiǎozuò Triangulum AustraleTriangulum Australe (constellation)
- 帕斯卡三角形 pàsīkǎsānjiǎoxíng Pascal's trianglePascal's triangle (mathematics)
- 泛珠三角 fànzhūsānjiǎo Pan-Pearl River deltaThe economic and geopolitical region comprising nine provinces of Southern China along with Hong Kong and Macau.
- 泛珠江三角 fànzhūjiāngsānjiǎo pan-Pearl River deltathe Pan-Pearl River delta (economic zone including the provinces around Guangzhou and Hong Kong)
- 珠三角 Zhū Sānjiǎo Pearl River Delta
- 等腰三角形 děngyāosānjiǎoxíng isosceles triangle
- 长三角经济区 Cháng Sānjiǎo Jīngjì Qū Yangtze Delta regionYangtze River Delta Economic Zone (economic region including Shanghai, Zhejiang and Jiangsu)
