| A | B |
| triangle | object with 3 sides |
| trilogy | series of three relates stories |
| tricycle | pedal-driven vehicle with 3 wheels |
| trillion | #1 followed by four sets of 3 zeros |
| triathlon | athletic competition |
| triad | group of three people or things |
| tricep | muscle that has 3 oints of anchorage |
| trident | three pronged weapon |
| tripod | frame or stand with 3 legs |
| trisect | divide into 3 equal parts |