Merriam-Webster takes a pretty generous view: 2 : a usually movable cover or screen for a window or door In practice, I think we agree on what blinds are, but when blinds are made of hard stuff like wood, Americans may actually call them shutters (interchangeably with blinds).

I think it’s uncommon in the US to have exterior blinds as shown in your picture. But I wouldn’t call them ‘shutters’ and I don’t think other Americans would either. ‘Exterior blinds’ sounds like a pretty good name to me. In the US, functional shutters aren’t very common either, but they can be found in places that are stormy or on buildings that are often unoccupied.

Im the US, when they're outside of the house, on the exterior, we call them shutters. Or, sometimes storm shutters as they are meant to protect the windows during storms. Unless you're in Florida or somewhere with hurricanes, they are almost always decorative and they don't actually function. 'Blinds' are on the inside of the house for blocking or allowing in sunlight; usually made of horizontal slats, although sometimes they can be vertical, and usually actuated by a string/cord. If it's just a big roll-up sheet type thing, we may often call it a 'window shade,' but you could also call it a blind.