Symbol 1564 from ISO 7000 - Title/Meaning: Volume, half full 
Function/description: To indicate that the container is half-full. To identify the half-full reading or position indicator on the display or container.
Own work using: iso.org/obp/graphics/grs/a87b4b4a-5436-4a30-8f0c-3ce34ba29569 200.png
Vectorization:  Mrmw