number-withheld phone calls
written notification; notification (written)
dismissal notice; pink slip (US)
job offer; letter of appointment; appointment letter; notification of appointment
out-of-office notification (email)
notification area; system tray; notification bar (on an Android device); notification drawer
notice of a change of address
non-receipt notification request indication
counter collection with advice; PD PR
non-delivery notification
explicit congestion notification
advice of receipt; AR; notice of receipt
obligation to give notice
victim notification system; VNS