KanjiJLPT N1
Mimeograph

mimeograph, copy

Mnemonic

Under the moon, a samurai sits copying his lord's words onto scroll after scroll — a living mimeograph. By moonlight the samurai duplicates each document perfectly, his brush reproducing words with machine-like precision for every outpost in the domain.
Additional thoughts
Picture the samurai hunched under moonlight, surrounded by piles of identical scrolls — each a perfect copy of the original words. Moon above, samurai at work, words multiplied endlessly.
Quick recall
A samurai copies words by moonlight — a living mimeograph.

Details

The keyword for 謄 is mimeograph. This kanji refers to the act of copying or transcribing a document, evoking the idea of reproducing written material in duplicate form. It is most commonly associated with the concept of making certified copies or transcriptions of official documents. The character carries the sense of faithfully reproducing words or text, much as a mimeograph machine was once used to create multiple identical copies.
On'yomi
とう