Of course, it’s not new, it’s simple thing that we can find every where about this code but I come with a remind here, especially for technical people who put the code to identify Khmer language in their apps or websites.

Do not confuse with KH & km, KH is identify for country name like we can see now in Windows Vista or 7 the country code is KH but to identify the language, Khmer in your website, you should name it: km instead and the locale code is: km-KH (or km_KH).

Here is a short list about Cambodia:

Description	Value
Base locale ID	km-KH
Language	km
Language	Khmer
Country	KH
Country	Cambodia

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To further understand about ICU related to Khmer language, check here.