Reason: Japanese Wikipedia article on ジャマダハル (jamadhar) states that "the western naming convention of Indian push daggers as katar, kutar or katara is actually a misapplication of the word, as katar properly refered to a type of double-edged short sword."
"This misinterpretation arose from the illustrations of the katar and jamadhar being reversed in 'Ain-i-Akbari' a 16th century historical account authored by Abu'l-Fazl, who served Emperor Akbar of the Mughal Empire."
Updated by jxh2154