GUID
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A GUID or Globally Unique Identifier is a (typically) 128-bit number to uniquely reference or identify something; on the IndieWeb, GUIDs are encouraged in some feed file formats as supposedly more persistent than permalinks but in practice GUIDs have been less portable and harder to preserve/migrate/restore than permalinks.
Criticism
Less portable than permalinks
So I redesigned my blog.
[...]
After 14 years of blogging, I switched from MovableType to WordPress. [...] It took some effort, but I preserved the links to everything I’ve ever written—472 posts and 15,891 links.
[...]
The RSS feeds should redirect appropriately, though inevitably marking everything as new because I couldn’t migrate GUIDs.
emphasis added