Does anyone know another name

[Mesquite]

For this type of chain?

B&Q has it listed as a double twist signal chain but my google fu is lacking as when I do a search for it with that name nothing comes up.

 

[Kepis]

Toilet Chain / Cistern Chain

 

[Broch]

For this type of chain?

B&Q has it listed as a double twist signal chain but my google fu is lacking as when I do a search for it with that name nothing comes up.
View attachment 79511

I know them as double loop jack chains or just double jack chains- but that may refer to a wide range of chain types, I'm not sure.

 

[Jared]

Double Jack Chain

 

[Ystranc]

Agreed, double Jack chain. Unwelded chain used for light weight applications