From Wiktionary, the free dictionary
hāŋ
- Rare spelling of hāng.
- 漢語拼音方案/汉语拼音方案 (Hànyǔ Pīnyīn Fāng'àn, “Scheme for the Chinese Phonetic Alphabet”) specifies that ⟨ẑ⟩, ⟨ĉ⟩, ⟨ŝ⟩ and ⟨ŋ⟩ may be used as abbreviations for ⟨zh⟩, ⟨ch⟩, ⟨sh⟩ and ⟨ng⟩ respectively, though these are rarely used in practice.