What does an asterisk (*) mean when shown beside a field name in the attribute table? I would think those are reserved field names but they are not.

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2 Answers 2


It means that the field is indexed. You can change the character used to indicate whether a field is indexed under the Table Options > Appearance menu:

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  • Thanks! SO i guess those get generated automatically. Because I did not create any indexes. Jan 9, 2015 at 17:46
  • I stand corrected. We did index those fields. THanks Jan 9, 2015 at 18:55

The asterisk means that the field has an index. A Shapefile does not have any indexed fields by default, you need to add them. A GeoDatabase Featureclass always has a spatial index on the Shape field and attribute index on the ObjectID.

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