| thiemowmde added a comment. |
I believe this is going the wrong direction, because numeric entity IDs are almost completely phased out already. A big chunk of that was done in 2016 via T56085, and a whole lot of other tickets, most notably the work the team put into migrating the wb_terms table. The newFromNumber methods that are still in the code are barely used any more.
What this ticket asks for should be resolved via a feature we call "federation": The possibility to reference entities that are stored on other Wikibase instances. This is solved via prefixes. See T76007 and T149580 and the linked tickets.
Fiddling with somehow unique letters would not work in the long run, as we would need a global registry for these Q, P, Y, and so on to guarantee they can never clash. But there are only 26 of them. See T73996 for an older discussion about exactly this idea. Prefixes as defined for the "federation" feature don't have this problem. These prefixes are not globally unique, but locally defined, and map to URIs, which are guaranteed to be unique.
Cc: thiemowmde, Bugreporter, gerritbot, daniel, Aklapper, Yurik, stebsco, Gaboe420, Versusxo, Majesticalreaper22, Giuliamocci, Adrian1985, Cpaulf30, Lahi, Gq86, Baloch007, Darkminds3113, Bsandipan, Lordiis, GoranSMilovanovic, Adik2382, Th3d3v1ls, Ramalepe, Liugev6, QZanden, LawExplorer, Lewizho99, Maathavan, Wikidata-bugs, aude, Mbch331
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