Symbol 3321 from ISO 7000 - Title/Meaning: Progress toward completion, 75% complete Function/description: To indicate that the process is 75% complete.
pay attention to orientation of symbolAdditional information: 
The lines in the first, second and third quadrants may be replaced with appropriate fill-in colours or progressively darker grey scale.
Own work using: iso.org/obp/graphics/grs/901a2808-8760-42fb-862f-5b29a2d5a5cd 200.png
Vectorization:  Mrmw