more about numbers

A quick guide to the Arabic language numerals haji numbers.
That's confusing already because we use Arabic numerals, right? Well, yes... but also no. In fact the impenetrable muddle of varying combinations of compass directions and adjectives referring to India used with or without the word 'Arabic' in order to refer to the two systems in question, as well as a few others, with technical accuracy is so far from helpful (see here and here) that I will henceforth and retroactively refer to them as "real numbers" and "haji numbers."
As with their names, the similarities between the systems are of more use to someone who wants to be hopelessly confused than to anyone who wants to learn how to read haji numbers.
Here's the breakdown: 1 is one, so that's simple enough, but you skipped 0 which isn't zero because zero is a dot while 0 is five. The Roman numeral V, however is seven while 7 is six and two is a backwards 7. A backwards 3 on the other hand is four, while three is very similar to the backwards 7 that is two, except that it's squiggly on top. This brings us right along to eight, which is an upside down V (seven) making seven officially the sworn enemy of all haji number novices. 9, mercifully, is nine.
And if that made sense to you the first time through, you should go get your head examined.