Is the BTicino plug (https://www.plugsocketmuseum.nl/Italian2.html) used at all in Italy now? There was a serious attempt at adopting it in Iceland in the late 1970s to early 1980s. These sockets can still be found in homes that were built in that period and they are just called "Italian sockets".
Never seen such a plug before in my life, but I have spent very little time anywhere near Ticino
In Italy I have mostly seen (https://www.plugsocketmuseum.nl/Italian1.html) 1,2,4,5, schukos like 17a and when lucky schukos like 9 and 10; I have never seen most of the others.
Never seen this one in Italy, and I've been in several fairly old buildings.
Oh I know, I lived in a old house as well and circled through europe so I've seen/suffered all the plugs from UK/France/Germany/Italy...
In this regard, long live the "europlug" and the trend switching towards type F sockets.
But I was just lamenting the bulkiness of it in general.
the compatibility table is not trivial (in particular the europlug is compatible with everithing except the big type L sockets) and while new houses might be to nicer standards, there are a lot of very old houses in italy (i lived in a house from ~1850) and many public spaces use the cheapest sockets they can find so you either get a small type L (accepts also europlugs) a simple schuko (accepts also europlugs and unhearthed small type L) or a big type L (accepts only big type L).