Unicode 5.2
Character
Pinyin E2 WO4 YI3 Jyutping ngo4 ngo6 On GI Kun ISO IWAO
Xerox code 312 : 320

Unicode 12.1
Character
Pinyin Jyutping ngo4 ngo6 On GI Kun ISO IWAO Hangul :N
Xerox code 312 : 320

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