New answers tagged orthography
The basic answer is that は is written ハ in katakana. However, I think it depends on why it's written in katakana. One reason you might write something in katakana is to communicate pronunciation, and in this case the particle は would be written ワ: spelling pronunciation おはよう オハヨー こんにちは コンニチワ You can see this sort of use of ...
You can see it's ハ as in an old MS office assistant dialog box
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