Symbol 5033 from IEC 60417 - Title/Meaning: Both direct and alternating current Function/description: To indicate on the rating plate that the equipment is suitable for both direct and alternating current (universal); to identify relevant terminals.
Additional information: 
Published in: First edition, 1973
Own work using: iso.org/obp/graphics/grs/f74f0ce4-729c-4f0d-a205-e3d5d74e0151 200.png
Vectorization:  Mrmw