popular initiative

Request submitted by a minimum of 100,000 voters to undertake a complete revision of the Federal Constitution or to adopt, repeal or amend a provision of the Constitution.

https://www.bk.admin.ch/content/bk/en/home/dokumentation/abc-der-politischen-rechte/volksinitiative-in-bundesangelegenheiten--eidgenoessische-volksi.html