Symbol 5005 from IEC 60417 - Title/Meaning: Plus; positive polarity Function/description: To identify the positive terminal(s) of equipment which is used with, or generates direct current.
Additional information: 
The meaning of this graphical symbol depends upon its orientation
Published in: First edition, 1973
Own work using: iso.org/obp/graphics/grs/4a6e5ac6-d38d-4a96-a0a2-4481cb66e20d 200.png
Vectorization:  Mrmw