Lesbian rule
flexible mason's rule made of lead that could be bent to the curves of a molding, and used to measure or reproduce irregular curves
en-US/ˈlɛzbiən ˈɹul/
en-GB/ˈlɛzbɪən ˈɹuːl/
flexible mason's rule made of lead that could be bent to the curves of a molding, and used to measure or reproduce irregular curves