From The glossary of Agenzia delle entrate

CARTELLE DI PAGAMENTO - NOTICES OF PAYMENT
Notices prepared by the collection agents and notified to the taxpayer through their staff or sent by registered post, containing the invitation to pay the amounts registered within sixty days.
The notices include, among other things, the date on which the role became effective, the description of charges with the relative motivations, instructions on how to pay and indications of how to appeal.
If the taxpayer considers the request to be correct, he/she can pay the notice at the offices of the collection agent, in a bank or at the post office; if he/she doesn’t consider the request correct, the taxpayer can ask for clarifications from the office responsible for the charge (and therefore not to the collection agent, who is a simple executor) even by telephone: this can be done through the multi-channel assistance centre (number 848.800.444). If the taxpayer still believes that the charge is unfounded he/she can present an appeal within 60 days from notification.

Also confirmed in:
Dizionario giuridico inglese-italiano: integrato con il lessico politico
By Igino Schraffl - see pg 23

A notice = avviso di accertamento, cartella esattoriale