When speakers wish to convey the consonant very clearly, for example in classical singing or when spelling things out to someone who can't hear the speaker well, [m] may be used in place of [ɴ], and potentially even in all other positions.
The katakana syllabary is used primarily for transcription of foreign language words into Japanese and the writing of gairaigo (loan words), as well as to represent onomatopoeias, technical and scientific terms, and the names of plants, animals, and minerals. It is also occasionally used in some words for emphasis, or to ease reading; katakana may be preferred for words becoming buried in the text if they are written under their canonical form in hiragana. Names of Japanese companies, as well as certain Japanese language words such as colloquial terms, are also sometimes written in katakana rather than the other systems. Formerly, female first names would often be written in katakana.
(Vietnamese Classical Chinese) ン is used to indicate that a character or a phrase should be reversed to match Vietnamese word order, sometimes used with ⌝ to mark the beginning of the phrase. Similar to Japanese レ点.
In the Classical Chinese text, the original phrase is written as ⌝田中ン (điền trung), but ン indicates that the order should be reversed to 中田 (trung điền). This shows that the text is being read semantically, with the Classical Chinese word order reversed to match Vietnamese word order. It would be read as 𥪝𪽞 trong ruộng (in a field).
⌝田中ン điền trung -> 𥪝𪽞 trong ruộng (in a field)
Vietnamese reversal mark ン in the book, Khai tâm hán văn giáo khoa (1924)
⌝父母之聲ン Phụ mẫu chi thanh -> 蒸㗂吒媄 chưng tiếng cha mẹ (sound of parents)
⌝深山中ン Thâm Sơn trung -> 𥪝准深山 trong chốn Thâm Sơn (in Shenshan)
⌝床上ン sàng thượng -> 𨕭床 trên giường (top of the bed)
⌝家中ン gia trung -> 𥪝茹 trong nhà (in the house)
⌝孝心ン hiếu tâm -> 𢚸討 lòng thảo (filial heart)
