(I'm Indian.) Yes, India groups the first three digits and then subsequent groups are two digits, eg 12,34,56,789. So instead of hundred thousand it's lakh, and

(I'm Indian.) Yes, India groups the first three digits and then subsequent groups are two digits, eg 12,34,56,789. So instead of hundred thousand it's lakh, and instead of hundred lakhs it's crore. We never learned any numbers above crore in school. I remember hearing about arab from other kids but never saw it used, and I never heard about the others you mentioned.