Newbie Question. IOS Version. What does the end codes mean?

Unanswered Question

Basic question but I can't find anything about them online.

Can someone here let me know what the following means please.

In the IOS version what does SE1 or SEF1 or SEF3 (some also have ED afterwards).

I want to standardise the IOS version across all our switches, but obviously want to ensure I get the right version.

Thanks in advance.


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