Rūpa
rūpa
Materiality, form
Rūpa is what is ‘molested’ by cold, heat, hunger, etc. Twenty-eight rūpas are taught: 4 great elements, 24 derived (upādā-rūpa) including sense faculties, sense objects, sex, heart base, life faculty, nutriment, space, intimation, mutability, and characteristics.
In short
The 28 physical phenomena analysed in Abhidhamma.