Page Unit Symbols. Previously, I had several drawing label symbols that I would use on different projects. Because we would different layer scales, I needed to have a different symbol for each layer scale that I used. What a pain, having all those symbols, symbol folders, and maintaining them.
In Vectorworks 2011, you have a choice when you make a symbol. The symbol can be based on the world units, or page units. Use world units for things that have a real size, things like timber components, bricks, blocks, windows, fixtures, and so on. Use page units for things that are sized for graphic reasons, things like drawing labels.