I'm not sure if the common person would know this or not, but the Cham and Khmer version of 7 also looks similar to their form for 1, though not in the same way 7 and 1 look in European text.
Im not sure about that but  As is the case with the European glyph, the Cham and Khmer glyph for 7 also evolved to look like their glyph for 1
Seven's my favorite number, because everyone says it's a lucky number.. but why do they say that! What's the history behind 7 Well, it's the natural number following 6 and preceding 8. Of course... but is there more about it? Why has it been seen as somewhat of a special number throughout history? Anything interesting about it? I really don't know. What I can say, however, is that the Hindus wrote 7 more like an upside-down J. Alright, interesting. Some history there. What else is a fun fact about it? The European form of 7 was influenced by Arab forms, which is a horizontal line at the top joined by a vertical line on the right going down to the left. Oh, that's pretty cool. What's another fact the common person might not know?
As is the case with the European glyph, the Cham and Khmer glyph for 7 also evolved to look like their glyph for 1, though in a different way, so they were also concerned with making their 7 more different.