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What does T2 stand for?

T2 stands for transverse relaxation

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The transverse (or spin-spin) relaxation time T2 is the decay constant for the component of M perpendicular to B0, designated Mxy, MT, or. For instance, initial xy magnetization at time zero will decay to zero (i. e.
transverse relaxation trans·verse re·lax·a·tion in nuclear magnetic resonance, the decay of the nuclear magnetization vector at right angles to the magnetic field after the 90° pulse is turned off; the signal is called free induction decay.
The application of NMR to large molecules is normally limited by the fact that the line widths generally increase with molecular mass. Larger molecules have longer rotational correlation times and consequently shorter transverse relaxation times (T2). In other words, the NMR signal from larger molecules decays more rapidly, leading to line broadening in the NMR spectrum and poor resolution.
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Any excited magnetic moment (generally excited by a radio-frequency pulse) relaxes back to equilibrium on the z-axis. There are two mechanisms involved: spin-lattice and spin-spin. Spin-spin relaxation is also referred to as transverse relaxation or T2 and describes the decay of the excited magnetization perpendicular to the applied magnetic field (fig. 1). The observed spectral line-width is related to the spin-spin relaxation but is also affected by magnetic inhomogeneity.
transverse relaxation time An MRI term for the time constant, T2, which determines the rate at which excited protons fall to equilibrium or go out of phase with each other. TRT is a measure of the time taken for spinning protons to lose phase coherence among the nuclei spinning perpendicular to the main field due to interaction between spins, resulting in a reduction in transverse magnetisation.