Abbreviation of 'wrong font', commonly used in printing and publishing industries.
w.f. — 用于印刷或排版行业,表示某处使用了错误的字体,需要修正。
“The proofreader wrote 'w.f.' next to the paragraph in Times New Roman.”
(校对员在Times New Roman字体的段落旁标注了'w.f.'。)