> Many times I notice that I have written a hex number as 'ox1234' instead of '0x1234'.
On old fonts 0 was ∅ (well not this letter but with a line like in this example) so it was easy to spot it. But we are living on a planet that's revolving and evolving ...
I wonder if that is a subconscious thing as I tend to call '0' as 'oh' rather than 'zero'. (I grew up calling the '0' in phone numbers as 'oh', along with the rest of my cultural peers.)