A "signature piece" refers to something that is unique and represents a person or brand's distinct style or identity. It is often a standout or well-known creation that is specific to them and sets them apart from others. Full definition
Turn a plain space into something extra special with signature pieces of furniture like these yellow dining chairs. (idealhome.co.uk)
As you look for signature pieces for your own home, think about why you are drawn to a highly functional coffee table or a simple geometric painting. (invaluable.com)
Luckily this outfit was put together with signature pieces I have had for years. (missyonmadison.com)