B₀

B₀, that is "B subscript zero", is also generally used in Magnetic Resonance Imaging to denote the net magnetization vector. Although in physics and mathematics the notation to represent a physical quantity can be arbitrary, it is generally accepted in the literature, such as the International Society for Magnetic Resonance in Medicine that B₀ represents net magnetization. This is particularly prominent in areas of science where magnetic fields are important such as spectroscopy. By convention, B₀ is interpreted as a vector quantity pointing the z-direction, with subsequent x and y cartesian axes oriented with the right hand rule.

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B₀ is also the symbol often used to denote the reference magnetization in which equations with electromagnetic fields are normalized.