I had no idea that the back of the envelope between the closing flap and the bottom flap had a name - and throat is quite descriptive.Your post also made me wonder where the word window comes from, as even in German it seems to have a Latin origin. Apparently English kept an Old Norse word vindauga (literally wind eye).
There is a name for everything,but often we don't know!I found this about the word 'window'.
N'haurem de dissenyar un en català.
Em recordaria els meus temps de terminòloga... :)
Thank you for coming. All your comments make me extremely happy.