What alphabet system was inspired by Etruscan numerals and was used on the Italian Peninsula?
Etruscan numerals:  The system was adapted from the Greek Attic numerals and formed the inspiration for the later Roman numerals via the Old Italic script. Old Italic script: Old Italic is one of several now extinct alphabet systems used on the Italian Peninsula in ancient times for various Indo-European languages (predominantly Italic) and non-Indo-European (e.g. Etruscan) languages.
Old Italic script