The best icon is the original MacWrite icon by Susan Kare [1]. No superfluous details, simple, and communicates the act of writing perfectly.

Susan’s suite of original icons for the Macintosh set a high watermark for legibility, usability, and comforting design. We really haven’t returned to that level of ease of use ever since.

[1] https://1.bp.blogspot.com/-XLfMbsAfWqc/Vtae74eUHmI/AAAAAAAAH... (bottom row, 3rd from right)