Ok what are these that I've highlighted?

[raindropsies]

I have not come across them before, I didn't know they existed, and no idea where (if anywhere) I can see info on them.

[somersethedge]

well I'm not saying it is on theis site but.....

I googled it and found this on the darkside

Cross-promoting – showing your other items to buyers – is a powerful tool to give buyers more options with their shopping experience. Showing other items can help you sell more items per buyer, and sell to more buyers.

have to admit when Pam and I were on the darkside I set up a cross promotion between her listings and mine