「Selections」

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Clipboard(剪贴板)

Selections(选择缓冲区)

参考文献

Linux鼠标中键复制粘贴之谜【Felix蛋疼科普贴】: http://blog.renren.com/share/220882136/12904016948
What’s the difference between Primary Selection and Clipboard Buffer?: https://unix.stackexchange.com/questions/139191/whats-the-difference-between-primary-selection-and-clipboard-buffer
Wikipedia / X Window selection: https://en.wikipedia.org/wiki/X_Window_selection
How to toggle or turn off text selection being sent to the clipboard: https://unix.stackexchange.com/questions/213840/how-to-toggle-or-turn-off-text-selection-being-sent-to-the-clipboard
Arch Wiki / Clipboard: https://wiki.archlinux.org/index.php/clipboard