Symbol 5412 from IEC 60417 - Title/Meaning: Screen or video image, reference field Function/description: To indicate everything concerning the reference field.
Additional information: 
Published in: Supplement G, 1985
Own work using: iso.org/obp/graphics/grs/fa5685b6-affc-4af2-be21-5a4c068f4a8d 200.png
Vectorization:  Mrmw