It is used in handwritings from the Western world.
I don't use it much but it's never used in computer fonts
the number 7 is a great number. I can only say that its the number after 6 and before 8. I heard that 7 has various strokes that makes it look like other numbers? Yes, there is a horizontal stroke for 7 which separates it from 1 for those writing that use long upstrokes for 1. yea those two can get confusing Did you ever use the horizontal stroke through the center? That is used in Western world handwriting but just about never for computers. Yeah I do, it looks clean to me. What part of the world did you say it was used in?
This is analogous to the horizontal stroke through the middle that is sometimes used in handwriting in the Western world but which is almost never used in computer fonts.