Singlet

Singlet may refer to:

• singlet state, in theoretical physics, a quantum state with zero spin
• Singlet fission, in molecular photophysics
• 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
• Singlet oxygen, the common name used for an excited form of molecular oxygen