Symbol 5812 from IEC 60417 - Title/Meaning: Patient position, prone Function/description: To indicate a reference to a patient in a prone position (lying on his front).
Additional information: 
Published in: 3C/1289/FDIS, 3C/1335/RVD
Own work using: iso.org/obp/graphics/grs/b6f3fe2a-5fcd-48f4-9145-7516b04a0eea 200.png
Vectorization:  Mrmw