Aluminum / Aluminium
aluminum (or aluminium depending on where you are when you read this) is a type of metal.
aluminum is a soft metal in it's natural state, so it's not suited for use in fencing. However, there are some alloys or mixtures of aluminum and other metals that can be used for fence structures, wire and mesh production.
This type of fence is often used in places where there is a concern that steel might corrode, like near the ocean. It's also much lighter than steel, so it's ideal for locations where weight is a factor.