，常量；常项 ，常元- twin prime cluster
- twin prime conjecture
- twin prime numbers
- twin primes
- twin primes constant
- twin Pythagorean triple
- twins
- twins problem
- twirl
- twist
- twist boundary
- twisted
- twisted algebra
- twisted Chevalley group
- twisted conic
- twisted cord illusion
- twisted curve
- twisted cylinder
- twisted form
- twisted group
- twisted group ring
- twisted phase
- twisted product
- twisted quadrangle
- twisted ring