I'm not very sure about that. However the number was developed from a 6 lookalike by eastern Arabs.
i'd like to know about 7 from you Okay. The number 7 is after the number 6 and before the number 8. anything else? Early in time, the number 7 was written more in one stroke as a curve. does it have the same signifance in every language?
The eastern Arabs developed the character from a 6 lookalike into an uppercase V lookalike.