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The tau sign represents the appearance of a persistent primitive trigeminal artery on the sagittal plane of an angiogram or on sagittal MRI images. It resembles the Greek letter τ, pronounced "tau", and is equivalent to the modern-day "T" in the Latin alphabet.
The vertical and anterior horizontal limbs of "Tau" are formed by the internal carotid artery (ICA) and the posterior horizontal limb is formed by the proximal portion of the persistent trigeminal artery.