Singlet

Singlet may refer to:

singlet state, in theoretical physics, a quantum state with zero spin
in spectroscopy, an entity appearing as a single peak; see NMR spectroscopy
in optics, a single lens element, the building blocks of lens systems; see lens (optics)
a one-piece collarless garment, also known as a sleeveless shirt or vest
- wrestling singlet, a one-piece garment specific to wrestling
BID/60, a British encryption machine

and also :

Singlet oxygen, the common name used for the diamagnetic form of molecular oxygen

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