Pintle and strap hinge, the pintle is the post that the strap slide onto. Around here, most people just call them lift off hinges. There are a bunch of different configurations available for the pintle, you'd just have to hunt for the right one.
It's certainly a kind of gate hinge as MakerofSawdust said, but I don't know if there's a more specific name for that exact kind.
Usually when people do some kind "yee olde" look they use an ornate strap hinge, but in the very many old gates and doors I've seen, the kind you've got pictured is more common. Notice that you can lift off the gate with that hinge.
Looks like a typical strap hinge.. except for the pintles, which are usually "L" shaped screws that go into the gate post.. only difference is those are surface mounted instead. You can get them at the borg, such as these:
They are galvanized, but you can paint them any color you want.
I wouldn't call it a strap hinge because at least for medival doors, your usual strap hinge is mounted onto a wooden frame within the stone arch, while this particular hinge is usually mortared into the wall, as you can see in the picture in the link.
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