CNTRL: control (non-printing) characters.

cntrl：控制(非打印)字符。

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Space: The non-printing areas in a forme. For text matters, there are; letter space; word space and line space , etc.

空位：印版内的非印纹位置。在内文的空位，称为间距；分别有字母间距，字词间距和行间距。

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Cat can also help when you are viewing files that contain non-printing character like tabs. You can reveal them with these options.

cat还可以在您查看包含如制表符这样的非打印字符的文件时起帮助作用。

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Despite the unsettling notion of a technology that lets anyone download a lethal weapon as easily as an pirated episode of Game of Thrones, regulating 3D printing to prevent gun printing would be both counterproductive and ineffective, argues Michael Weinberg, an attorney with the non-profit Public Knowledge who focuses on the legal issues around 3D printing.

FORBES: 'Wiki Weapon Project' Aims To Create A Gun Anyone Can 3D-Print At Home

However, the non-art mainstream publishing industry is not an exemplar of the printing arts.

FORBES: Sandy inspires a good market decision

Many non-Western literatures were stagnant before Western fiction, the modern printing press and the bookstore made significant inroads.

FORBES: Modern Mix