| English | Japanese |
| constant strain triangular element | 三角形定ひずみ要素 |
| n eastern triangular butterflyfish | ミカドチョウチョウウオ (Chaetodon baronessa) |
| n form of torture in which the victim kneels on triangular wedges and stone slabs are placed on their lap | 石抱き |
| n of clerical script horizontal lines ending in a noticeable triangular tail | 波磔 |
| n in calligraphy, a triangular stroke going from upper left to lower right | 右払い |
| n modifier letter triangular colon | 長音符 (IPA diacritical, ちょうおんぷ) |
| n Russian 3-stringed instrument with a triangular body | バラライカ |
| n the six historical styles of writing kanji: large seal, small seal, clerical, triangular-swept clerical, running, and cursive | 六体 |
| n triangular area | 三角部 |
| triangular arrangement | 千鳥形配列 |
| n triangular bandage | 三角布 ik |
| n triangular bandage | 三角巾 |
| triangular channel | 三角形水路 |
| triangular coordinates | 三角座標 (さんかく・ざひょう) |
| triangular decomposition | 三角分解 |
| triangular diagram | 三角ダイアグラム |
| triangular diagram | 三角座標土の、 つちの (さんかく・ざひょう) |
| triangular element | 三角形要素 |
| triangular end sill | 三角エンドシル |
| n triangular frame of a thatched roof | 合掌組 (がっしょうぐみ) |
| n triangular frame of a thatched roof | 合掌組み |
| n triangular frame of a thatched roof | 合掌 news2 nf45 spec2 (gasshō) |
| n triangular hairpin | パッチン止め |
| n triangular hairpin | パッチン留め |
| triangular kerchief | 三角布 ik |
| triangular kerchief | 三角巾 |
| triangular notch weir | 三角堰 (さんかくぜき) |
| triangular or trigonal pyramid | 三角錐 |
| n triangular part of inferior frontal gyrus | 三角部 |
| n triangular pattern of objects | 品文字 from the shape of 品 |
| n triangular pennant | 三角旗 |
| n triangular piece of fabric, used for making skirts, umbrellas, etc. | ゴア (goa) |
| n vs triangular position | 鼎立 |
| n triangular prism | 三角柱 (sankakuchū) |
| triangular profile weir | 三角断面堰 |
| n triangular pyramid | 三角錐 |
| n triangular pyramid with equilateral base | 正三角すい |
| n triangular pyramid with equilateral base | 正三角錐 |
| n triangular rimmed ancient mirror decorated with gods and animals | 三角縁神獣鏡 |
| triangular shoe | 三角シュー |
| n triangular sink tidy | 三角コーナー (usu. used to strain waste) |
| n triangular-swept clerical script | 八分 (clerical script whose horizontal lines end in a noticeable triangular tail) |
| triangular thread | 三角ねじ (sankaku-neji) |
| n triangular three-pillar torii | 三柱鳥居 |
| triangular weir | 三角せき (sankaku-seki) |