Symbol 6034 from IEC 60417 - Title/Meaning: Rough service luminaires Function/description: [To identify the luminaire designed to withstand sever mechanical handling.For further detail of requirements, see IEC 60598-1.]
Additional information: 
See also the graphical symbol ISO 7000-1325
A variant of IEC 60417-6034 with the line width of 4 mm was also supplemented.
Own work using: iso.org/obp/graphics/grs/9a298ead-cbea-4683-9f96-fc827bac0c38 200.png
Vectorization:  Mrmw