noun
true autograph; genuine handwriting
Refers to a work written in the artist's or author's own hand, as opposed to a copy or reproduction. Used especially for calligraphy, paintings, and historical documents.
この掛け軸は、あの有名な書家の真跡だそうです。
This hanging scroll is said to be a true autograph of that famous calligrapher.
博物館で、紫式部の真跡と伝えられる巻物を見た。
At the museum, I saw a scroll believed to be Murasaki Shikibu's genuine handwriting.
Compound of 真 (true/genuine) and 跡/蹟/迹 (trace/mark), literally 'true trace'. The spelling 真跡 is most common today.