W state

Etymology
From the first initial of Wolfgang Dür, one of the first people to report this state.

Noun

 * 1) A quantum state of three qubits which has the following shape: $$|W\rangle = \frac{1}{\sqrt{3}}(|001\rangle + |010\rangle + |100\rangle)$$. It is remarkable for representing a specific type of multipartite entanglement and for occurring in several applications in quantum information theory.