For further nitpicking: "etc." shall also end with '.' as it is the abbreviated form of "et cetera/caetera". Also, when used in an enumeration, it shall be preceded by a comma.

https://en.wikipedia.org/wiki/Et_cetera

And sentences generally end with periods, or release from confinement.

It's "&c" – Latin ligatures are important, especially in a thread like this! ;-)