Not metallic and not sure about ‘alternative uses’ but ceramic is good for finger rings at least. It’s non-conductive, you can use a pliers or tap it hard with a hammer to shatter it if needed, and if it snags on something in a horrific accident scenario it’ll usually shatter before degloving or severing a finget
iPhone SE also has that. It’ll disable the fingerprint on next unlock if you hold the power button for 5 seconds or mash the power button repeatedly (like 5 times in 2 seconds, therabouts). Pretty handy to know these things not only for police but if you get mugged. Everyone should know how to lock their phone out