U posts are similar but have a different profile.
In this area they are commonly used to mount speed limit signs and other road signs by public works departments.
This is the strainer that I use for my kiwi braces, for the loops of wire I use for my trellises and for my fence wire. At $6.15 a piece they are affordable and easy to use.
Here’s a picture showing what a bight is:
I would slide the gritted crimp sleeve on the free end of the wire, wrap the wire around the T post between two lugs getting the wire so tight that it couldn’t slip past the projection of the lug. I would bend the free end and the middle section of the wire so they were perfectly parallel and then slide the crimp sleeve as tight to the T post as possible, then use the correct slot on the tool to crimp it. I hope this makes sense now.