What does this symbol mean on the wiring harness?

I was moving my dash switches to some empty spaces to make room for some gauges when I came across this, anyone knows what's this for? Thanks

 

Oh no do Not cut that wire. Repeat do not cut that wire.

 

Nope not cutting it, just wondering what it means

 

Looks like a diff lock symbol. That must be a Volvo pictograph because that's not an ISO symbol that I'm aware of.

 

I don't think so, this is the wiring of my diff lock switch

 

That's not a diff lock you have, that's the inter-axle lock. Diff locks are in each diff (if spec'd with them).

 

That makes sense, it must be a Volvo specific symbol, that harness is not used it's just hanging in there so I assume the truck doesn't have a diff lock, only has an interaxle lock