A railing is a railing, whether it’s a wall railing, a fence, or a patio railing. They all share the same basic design: a horizontal bar at the top and another at the bottom, with vertical uprights connecting the two. A wall railing is essentially a short fence railing. A patio railing resembles a fence railing but features a convex bar as the top horizontal instead of a decorative top. A Juliet balcony is essentially a patio railing with a different mounting method, allowing it to attach securely to the house.
Which then brings you to gates, which really is a railing but with a slight difference in construction that allows it to swing open and closed. This applies to double or driveway gate which are just two railings.
Theoretically most designs, that is those with a pattern contained within them, like scrolls are rings etc can be converted to fit, any other wrought work mention above.