Symbol 5325 from IEC 60417 - Title/Meaning: Small focal spot Function/description: To identify controls or indicators associated with the selection of a small focal spot or the connections for the corresponding filament.
Additional information: 
Published in: Supplement G, 1985
Own work using: iso.org/obp/graphics/grs/a1322d4d-f528-40e2-b824-8be36ebcb534 200.png
Vectorization:  Mrmw