[xzcvczx]

"Put a loop on the q, to avoid confusion with 9"

yet the given example looks like a (badly drawn) 8 to me

[mkl]

Yes, a tick up and right at the bottom of the q's tail is clearer.

[teabee89]

or write 9 like in most parts of Europe, as a lower-case g, and write the letter g with a loop.

[arketyp]

Yeah. Cross your q's instead.