basic foundation line icons collection. groundwork, base, cornerst, underpinning, footing, support, substructure

vector icon line sign groundwork base cornerst underpinning footing support substructure bedrock scaffold framework basis structure infrastructure edifice establishment backb rudiments fundamentals basics essentials roots origin beginning starting point nucleus kernel heart essence core crux meat substance pith marrow gist mainstay anchor bulwark defense fortress protector shield safeguard