count how many times an attribute is repeated in a field

[GustavoCordero]

is possible to count how many times an attribute is repeated

[MarkBockenhauer]

Using ArcCatalog you could try the Frequency tool.

mark

[DanPatterson_Retired]

or use the Summarize procedure or this clunky display version

[DarrenWiens2]

...or symbolize your layer by category, which lists the feature count matching each attribute value.