I use a small pebble as an image for a period. I also have images for 0-9, 00-99, and 000-999. I don’t use PAO, but just have a single image for each number.
Examples:
1.008 – candle (1), pebble (.), sofa (008)
1945 358 483 290444 – woodpecker (19), werewolf (45); maifun noodles (358); Raymond (483); Nusrat (290), Roth (444)
(In the example, the images are separated with commas and locations are separated with semicolons.)