Initialism for free and open-source software.

• Software with available source code for use, modification, and redistribution.

自由和开源软件的缩写。

• 源代码可获取、可使用、修改并再分发的软件。

A ditch or defensive moat, especially around a fortification.

• Archaic or dialectal form.

壕沟或护城河，尤指环绕防御工事的沟渠。

• 古语或方言形式。