I reckon

--------------------------------------------------
Note added at 48 mins (2004-08-21 13:20:08 GMT)
--------------------------------------------------

http://www.infonuklir.com/Tips/tips_rad06.htm

International Unit for technical purpose (weight) : Newton (or N)
For non-technical : kg (in metric unit) or lb (in British unit)
International Unit for non-technical : kg

To measure food ingredients, the international unit of weight in Indonesia is the "gram, ons , kilogram, ton" and applies to foods such as flour, corn, sugar, grains, etc.

The International System of Units, (symbol: SI) (for the French phrase Système International d'Unités), is the most widely used system of units. It is used for everyday commerce in virtually every country of the world except the United States. SI was selected from the existing Metre-Kilogram-Second system of units (MKS), with the addition of extra units, rather than the older Centimetre-Gram-Second system of units (CGS). SI is sometimes referred to as the metric system (especially in the United States, which has not widely adopted it, and the UK, where conversion is incomplete).



The "iu" used in medical terms refers to substances such as Vitamin A etc. as can be seen in : http://www.medterms.com/script/main/art.asp?articlekey=9650 :
An international unit (IU) is an internationally accepted amount of a substance. This type of measure is used for the fat-soluble vitamins (such as vitamins A, D and E) and certain hormones, enzymes, and biologicals (such as vaccines).

The definition of an international unit (IU) is generally arbitrary, technical, and eminently forgettable. For example, an IU of vitamin E is the specific biological activity of 0.671 milligrams of d-alpha-tocopherol. Nonetheless, most IUs are quite handy and helpful in use as a means of standardizing measures.