In romaji, an apostrophe can be seen in the middle of some compound words. The reason for this is dividing the words that form that compound word and preventing a possible confusion. The consonant n can be in both the initial position in a syllable and in the final position (other consonants cannot be in the final position). Thus, it can be difficult to know whether a compound word such as onin (音韻) consists of the words o and nin or on and in. Writing this word as on’in, with an apostrophe after the certain n, eases the comprehension of the words. In the same way, the presence of the apostrophe indicates that the last 2 words of the word 護身用 are shin and yō, not shi and nyō.