Practical examples of Threshold Secret Sharing? Threshold secret sharing is pretty cool, but unlike, say, public-key cryptography, I haven't really heard about it "in the wild". It appears to be confined to discussions of theoretical scenarios, as I have not found any real-world software that claims to use it "in anger".

So, are there practical examples of threshold secret sharing in commercial, or at least publicly-available, systems?
I worked on a secure document management project 20 years ago which used secret sharing. It is widely used in financial networks. Actual use cases with public details that are easily accessible include: 


Threshold key sharing is used in Hardware Security Modules, for example to unlock the administrator account. In the Amazon CloudHSM documentation, this is explained in detail: 
Amazon CloudHSM: About M of N
Hashicorp's Vault uses Shamir's Secret Sharing during the "unsealing" process as explained here: (https://www.vaultproject.io/docs/concepts/seal.html) This enables reading and decrypting secrets from the storage backend.