Symbol 5324 from IEC 60417 - Title/Meaning: Iris diaphragm, closed Function/description: To identify the control for closing the iris diaphragm or to indicate the closed state.
Additional information: 
Published in: Supplement G, 1985
Own work using: iso.org/obp/graphics/grs/7d154274-660a-4ab8-9785-a6682beb0c29 200.png
Vectorization:  Mrmw