What does the "E" mean?

[Navycop]

33456 82b D Special Operations Division (SOD) Tactical 2
33472 82c Driver Training
33504 82e Surveillance
33696 83a Vice Surveillance
33728 83c Surveillance
33824 842 E Unid
33840 843 Surveillance
33904 847 E Unid
D=Digital (right)

 

[scg]

I would guess encrypted.

 

[FJB2022]

Yes it defentally means encrypted and thats probably why there unidentified talkgroups.