The numerals referred to here as 'Arabic' and 'Urdu' are those
used when writing those languages. The Urdu numerals are also known
as 'East Arab' numerals and differ slightly from those used in Arabic.
In Arabic they are known as "Indian numbers" (أرقام
هندية arqa-m hindiyyah).
The numerals 1, 2, 3, etc. are also known as Arabic numerals,
or Hindu-Arabic numerals, Indian numerals, Hindu numerals, European
numerals, and Western numerals. These numerals where first used in
India in about 400 BC, were later used in Persia, then were brought
to Europe by the Arabs. Hence the name "Arabic numerals".