Where is the windscreen washers fuse symbol in a Mitsubishi?

There isn't a dedicated windscreen washer fuse symbol in Mitsubishis. This is because the fuse for windscreen washers will most likely be covered under another symbol.

This is often referred to as the 'Accessory' or 'Cigarette Lighter' fuse. For further, consult the vehicle's manual which details the location and purpose of each fuse.