Shark
A shark object or icon found on Murdoku case maps.
Explanation
Shark appears as a board icon on the crime scene grid. When a clue card mentions "shark", locate that icon on the map and apply spatial rules such as beside, south of, or region constraints.
Example
If a clue says "beside the shark", find the shark icon on the grid, then check the four orthogonally adjacent cells in the same region.