What is this symbol on the ground connection?

I've come across the following symbol, boxed in red, in a single line diagram for a switchboard. From looking at it, I'm interpreting it as some sort of ground connector, but I want to confirm.

I have tried my best to search for it online but I've had no luck. I have tried the following and combinations of the following: ground connection ground symbols ground bus connection ground link ground disconnect electrical bus connection symbol

What is this symbol?

• Try “grid arc suppression with 500 MCM cable. 3/0 size” – Tony Stewart Sunnyskyguy EE75 Jul 2 at 22:34
• I wasn't able to find that symbol using any of those keywords. Found myself a few other new symbols though. – C. Lange Jul 3 at 2:49
• OK I guess it is a non-std symbol. But definitely not a 3phase & Neutral short circuit to Ground Bus. but no kV is given. – Tony Stewart Sunnyskyguy EE75 Jul 3 at 2:53

Found it. I stumbled across the symbol in the first diagram while searching up TVSS schematics. I then decided to go really general with the search and found the second diagram using service entrance rated switchboard schematic.

It is a disconnect link or bonding jumper.

Diagram 1

Diagram 2

from the context(circuit breaker switch), it looks like a thermal overload device symbol: