Numbers are a little tight so I recommend going slightly larger than you filament's shrink to be safe.

List of all features: numbers, arrows , 2 5 10 15 and 20mm circles, ~ for fuses and ac, + and -, capacitor, diode, and ground symbols, rectangle for resistors, angled corner for switches, U for all your U needs, and a top secret multi-use letter the government doesn't want you to know about (M, A, W, and V in one)