The Symbol Portfolio is an item from Mystcraft. It is designed for collecting and organizing Symbol Pages. All symbols added to it will be automatically sorted and stacked. It can be opened "in hand", or placed in a Writing Desk.
When viewing the contents, only those symbols in the portfolio will be visible by default. Pressing the "All" button at the top will show empty spaces for all pages which are defined but not present in the portfolio. Hovering over a symbol or empty space will show the symbol's name.