# Council Decision of 23 September 2013 on the security rules for protecting EU classified information (2013/488/EU), Division 12: The following standard abbreviations may be used within EU classified documents to indicate the classification level of sections or blocks of text of less than a single page:

Extent: E+W+S+N.I.

TRÈS SECRET UE/EU TOP SECRET
TS-UE/EU-TS
SECRET UE/EU SECRET
S-UE/EU-S
CONFIDENTIEL UE/EU CONFIDENTIAL
C-UE/EU-C
RESTREINT UE/EU RESTRICTED
R-UE/EU-R

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Source: https://www.legislation.gov.uk/eudn/2013/488/annex/III/division/II/division/3/division/12 (the official version)
Page: https://openlegislation.uk/eu-decision-2013-488/annex-III/division-II/division-3/division-12
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.