Select the most appropriate one-word substitution for the given group of words.

Something that is written in a letter after signature

Postscript

The most appropriate one-word substitution for "something that is written in a letter after signature" is postscript.

• Manuscript is a handwritten or typed copy of a book or other literary work.
• Postscript is a brief additional remark at the end of a letter, after the signature.
• Transcript is a written or typed copy of an oral or recorded statement.
• Epilogue is a concluding section of a literary work, typically added after the main body of the work.