What is the size of a "point" unit in ESRI Software?

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When creating point symbology with ESRI Software, we can use points, Inch, cm or mm as a unit of measurement.Due to the fact that there are a few definitions of a "pt" or point, which of the following definitions should be used?

1. Didot point (0.376065 mm)
2. Pica point (0.3514 mm)
3. DTP point (0.3528 mm)

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