particle

This term is defined in ECSS-E-ST-35-06C Rev.1 as
unit of solid matter with observable size”

This term is defined in ECSS-Q-ST-60-14C as
unit of matter with observable length, width and thickness”

This term is defined in ECSS-Q-ST-70-01C as
unit of matter with observable length, width and thickness

This term is defined in ECSS-Q-ST-70-50C as
unit of matter with observable length, width and thickness”