"Yotsuwari-bishi" tends to be considered the formal family crest because it was often drawn in Shingen's portraits, which were valued by the scholars of Koyoryu military science, and ukiyoe (Japanese woodblock paintings) during the Edo period.
江戸時代以降、甲陽流軍学者が信玄の肖像画を珍重し、その中や浮世絵などに盛んに「四つ割菱」の図柄が描かれてしまったために、「四つ割菱」が定紋であるかと思われがちである。