Amazfit Watch faces

I don't understand the difference between the moon and the bell items because I think I don't know exactly their own significations.
I don't know the signification of the padlock item too.
I also see a clock item in Bip U watch faces I ask me if it disponible for Bip S.
If you have answers you'll make me happy !

Moon=Do not disturb mode (On/Off)
Bell=Alarm (Set or not)
Bluetooth=Connection to phone
Padlock=Screen locked (Touch disabled)

Ok thanks
Could you specify the action of the padlock ?
I don't see differences between when it's activated and when it isn't.