“Superscription” in Japanese
Short answer
Superscription in Japanese is “外書き” (sotogaki). Full meaning: superscription; external text, external entry.
Other ways to say “Superscription” in Japanese
上書き
uwagaki superscription (on a letter, parcel, etc.), address; overwriting (data, file, etc.)
頭書
tousho headnote, heading, superscription, recitals; above-mentioned, referred to above
外書
sotogaki superscription; external text, external entry
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