Heng has been occasionally used by phonologists to represent a jocular phoneme in English, which includes both [h] and [ŋ] as its allophones, to illustrate the limited usefulness of minimal pairs to distinguish phonemes. /h/ and /ŋ/ are separate phonemes in English, even though no minimal pair for them exists due to their complementary distribution.[1]
Both U+A726ꜦLATIN CAPITAL LETTER HENG and U+A727ꜧLATIN SMALL LETTER HENG are encoded in Unicode block Latin Extended-D; they were added with Unicode version 5.1 in April 2008.
^Wells, John (3 November 2006). "The symbol ɮ". John Wells’s phonetic blog. Department of Phonetics and Linguistics, University College London. Retrieved 1 February 2018.
Chao, Yuen Ren (1934). "The non-uniqueness of phonemic solutions of phonetic systems". Bulletin of the Institute of History and Philology, Academia Sinica. 4 (4): 363–397.