Symbol 5386 from IEC 60417 - Title/Meaning: Beam limiting device, closed Function/description: To identify controls for closing the beam limiting device or to identify its closed state.
Additional information: 
Published in: Supplement G, 1985
Own work using: iso.org/obp/graphics/grs/a0fc1873-2577-43fb-8fb4-3dab3fc703b5 200.png
Vectorization:  Mrmw