What does 'CQ' at the end of my e-mail address stand for ?

[acu]

[rfc2822]

https://gitlab.com/bitfireAT/davdroid/blob/2f7debb42f5fb6499938721d771b42330422f262/app/src/main/java/at/bitfire/davdroid/resource/LocalAddressBook.java#L378 (it’s the hash)

[acu]

OK thanks, it’s the hash
But is CQ an acronym for something ?
https://en.wikipedia.org/wiki/CQ

[rfc2822]

@acu It’s the base64-encoded Java hashCode of the address book URL.