A pixel flag semaphore font.
# is the number/digit sign to put before letters A, B, C, D, E, F, G, H, I and K to make 1, 2, 3, 4, 5, 6, 7, 8, 9 and 0 respectively. That is already done in the numerals 0-9.
* is the attention sign (waving arms up and down together)
space is the rest position.
/ and \ both are the cancel sign.
Lower case d, i and x are variants.