An AHECC (Australian Harmonised Export Commodity Classification) Tariff code is a six to eight-digit code that helps classify a product category/type.
For example, if you wished to send a Men’s cotton shirt the code is: 620520
The first two digits, 62, specify the item is an article of apparel or clothing. This is called a chapter.
The second two digits, 05, specify the item is a men’s or boys’ shirt. This is called a heading.
The last two digits, 20, specify the shirt is made of cotton. This is called a sub-heading.
Some countries also add an additional 4 digits to further classify the goods.