I found this symbol in one of my control circuits. It is a part of a suction valve operated by a motor overload relay.

I have been pulling my hair out trying to find the meaning of this symbol and searched for this on Google and every possible forum, but with no luck. I am absolutely certain that this must be some silly symbol which I am unaware of and perhaps be well known.

[![enter image description here](https://i.stack.imgur.com/2LUu1.png)](https://i.stack.imgur.com/2LUu1.png)