Symbol 0536 from ISO 7000 - Title/Meaning: Water; fluid Function/description: To indicate water or water-base fluid.
Additional information: 
Primarily used as a symbol element in combination with other symbols to indicate specified types of water-base fluids. May be used when the type of water-base fluid is not specified.
Own work using: iso.org/obp/graphics/grs/51457f38-4cc6-4c15-bb54-48a9a7da3e0a 200.png
Vectorization:  Mrmw