how to tie a knot like this?

[bolt]

 

[castler]

That almost looks like a knot I'd use for storage. What's the purpose of the knot in question? If it's for non slippage I'd go for the 'girth hitch' it's simple won't Slip it can't.

I'll keep searching as I use to work arboristry but am so rusty on knots I'd have to look it up unless if that is used to tie down big ships?

 

[Life_and_Death]

That almost looks like a knot I'd use for storage. What's the purpose of the knot in question? If it's for non slippage I'd go for the 'girth hitch' it's simple won't Slip it can't.

I'll keep searching as I use to work arboristry but am so rusty on knots I'd have to look it up unless if that is used to tie down big ships?

Judging by the rings of rope, it looks like a hangmans noose

 

[castler]

I found it - it's called a "heaving line knot'' great for weighted objects.