Symbol 6295 from IEC 60417 - Title/Meaning: Concentric circle Function/description: To indicate the built-in lamp controlgear to be used in an enclosure to assure for double or reinforced insulation, and to provide information to differentiate it from the independent controlgear.
Additional information: 
For technical details, see I.6 of IEC 61347-1 Ed.2.2 (2012-11).
Meaning of ""class II luminaire"" is defined in 1.2.23 of IEC 60598-1, ed. 7.0 (2008-04).
For the graphical symbol called ""independent lighting auxiliary"", see also IEC 60417-5138 (2002-10).
Own work using: iso.org/obp/graphics/grs/e13a9647-4ed0-4dbf-9aa8-0e4f7bf1dc3e 200.png
Vectorization:  Mrmw