校对符号 meaning in English

proof corrections

Graphic technology . symbols for text correction
印刷工艺.文字校对符号
The proofreader ' s marks and their application
校对符号及其用法
Proofreader ' s marks for image reproduction
图像复制用校对符号
Wf is a proofreading symbol denoting use of the wrong typeface or size
中义wf是校对符号之一，用来标示使用了不正确的字体或大小。
Graphic technology - prepress printing process - part 1 : correction marks for images and additional marking
图形技术.预印制.第1部分:图形校对符号和补充说明