It might sound odd for a package to have a "+" in the package name, but it is used for several packages like "doc++" -- a documentation system for C/C++ code.

软件包的名称中包含“+”，这听起来很奇怪，但有几个软件包已经使用了“+”，如“doc++” — C/C++ 代码的文档系统。

youdao

The attachment contains the report data in text format in a file with the file name extension DOC.

附件以文本格式在文件中包含报告数据，文件扩展名为DOC。

youdao

We call the baby Doc. His actual name is Daniel.

我们把这个婴儿叫做多克，他的实际名字是丹尼尔。

youdao

Mike Edmondson, a spokesman for the state attorney in Palm Beach County, said it's often legal under Florida law for a doc to prescribe medication in a third party's name, if all parties are aware and the medic documents it correctly.

FORBES: Magazine Article

"I've had people who found my name on the Internet, and come in saying 'Hey doc, I'm an Internet addict, ' " he says.

CNN: Are gadgets, and the Internet, actually addictive?