不可见字符。如控制符、回退删除符、换行符等。

A character with no visible representation, such as a control character, a backspace, newline, and so on.

youdao

介绍了在VB环境中实现串行通信的技术，提出了一种解决不可见字符传输的方法。

Technique of serial communication realized by VB is introduced and a method for transmitting invisible characters is proposed.

youdao

屏幕上所显示的是 CCNA01# ；对于许多设备来说，这是非常典型的，这个提示符实际上嵌入了一些不可见的控制字符。

What shows on the screen is just CCNA01# ; as is typical for many devices, though, this prompt actually embeds invisible control characters.

youdao