Graffiti (Inventory)/Other
From LagWiki

Paint spilled or drizzled over bedrock and flowstone. This could be recorded as an other graffiti or as a possible restoration project.
The other graffiti field should be used to list stations which exhibit some type of human made markings other than pictographs. These may include things such as: paint, pencil marks, scratches, carvings, ink and other types of human made marks.
See also