Symbol 5323 from IEC 60417 - Title/Meaning: Iris diaphragm, open Function/description: To identify the control for opening the iris diaphragm or to indicate the open state.
Additional information: 
Published in: Supplement G, 1985
Own work using: iso.org/obp/graphics/grs/96cb06a9-846d-4380-9d6b-ba37bcaa133b 200.png
Vectorization:  Mrmw