I have a few TLA’s (ThreeLetterAcronyms) which I would like to add descriptions for. Is it possible to add pages to this wiki where all characters are uppercase, like STL, POD and similar?

No. The plurals, however… just leave out the apostrophe.

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Why not just use PODPlainOldData and STLStandardTemplateLibrary?

That would work too.

But then, why bother with the TLA in the first place? Also, I would then only do it if I really thought that people would not know the meaning, e.g. I wouldn’t start to write GUIGraphicalUserInterface and PixelPictureElement etc., even though definitions of these things would certainly be nice…