change display value of filter in admin

I have a field that has two values set "S" or "E". I use it to filter records in the admin. I would like the values in the filter to be spelled out as "Signature" and "Emerging". How do I have it show like that in Admin?


This is my filter:


list_filter = ('app_complete', 'app_type')


app_type is the field I want to change how the field values show to filter on.

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