@Benzenekim @sbb_news The use of ㅅ in such a way (e.g. 한ㅅ자) is well-known also from the 1920 朝鮮語辭典, see e.g. here https://t.co/HBfrNrQ9rx for the case of hancha 漢字.
(ㅎ지 is even cooler though. Not sure how wide-spread this was though?) https://t.co/JDyFf66Qk7