The story
Borrowed from Japanese 漢点字(かんてんじ) (kantenji, “Braille kanji”), from Middle Chinese 漢 (MC xanH, “Han dynasty, China”) + Middle Chinese 點 (MC temX, “dot, point”) + Middle Chinese 字 (MC dziH, “[written] character”)
Etymology from Wiktionary, CC BY-SA 4.0.