An example would be YouTube's video IDs. It's custom-fit for a purpose (security: no, avoiding the problem where people fish for auspicious YouTube video numbers or something: yes).
Another example would be a function that sorts the numbers 0 through 999 in a seemingly random order (but's actually deterministic), and then repeat that for each block of 1000 with a slight shift. Discourages casual numeric iteration but isn't as complex or cryptographically secure as UUID.
Another example would be a function that sorts the numbers 0 through 999 in a seemingly random order (but's actually deterministic), and then repeat that for each block of 1000 with a slight shift. Discourages casual numeric iteration but isn't as complex or cryptographically secure as UUID.