What does 450-mm domain or fabs means in IC fab technology?

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IC fab technology

I read here:
**broken link removed**

and don't understand the terms for IC fab such as "450-mm domain" or "450mm fabs"

what does it mean by the number 450mm here?

Thanks.
 

IC fab technology

450 mm mean the dimension of the wafer size. Currently, there are 300mm wafer size, 8 inch (200 mm Wafer size), 6 inch. The bigger the wafer, the more chip you can manufacture.
 

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