What is the correct way to write the abbreviation "sic" in text?

The abbreviation "sic," which is derived from the Latin term meaning "thus" or "so," is commonly used in writing to indicate that a quoted passage is reproduced exactly as it appears in the original source, including any errors or peculiarities. The standard practice for writing "sic" is to italicize it.

Italics serve to set apart the term from the surrounding text, drawing attention to the fact that it is an editorial note or annotation regarding the quote. This usage helps clarify to readers that the text contains a verbatim reproduction from a source, reinforcing the author’s intent to maintain authenticity while also signifying that any oddities in the original are not mistakes on the part of the current writer.

Other formatting choices, such as using bold font, underlining, or uppercase letters, are not standard practices for "sic" and can detract from its intended use and meaning within the text. Italicizing "sic" ensures that it is recognized as a specific editorial commentary rather than an error or part of the main narrative.