<Li> Name reference: The quantity has a subscripted or superscripted single letter, a number of letters, or an entire word, to specify what concept or entity they refer to, and tend to be written in upright roman typeface rather than italic while the quantity is in italic . For instance E or E is usually used to denote kinetic energy and E or E is usually used to denote potential energy . </Li> <Li> Quantity reference: The quantity has a subscripted or superscripted single letter, a number of letters, or an entire word, to specify what measurement / s they refer to, and tend to be written in italic rather than upright roman typeface while the quantity is also in italic . For example c or c is heat capacity at constant pressure . </Li> <P> The type of subscripts is expressed by their style, e.g. by italic style:' k' and' p' are abbreviations of the words kinetic and potential, whereas p (italic) is the symbol for the physical quantity pressure rather than an abbreviation of the word . </P> <Ul> <Li> Indices: The use of indices is for mathematical formalism using Index notation . </Li> </Ul>

What is the name of physical quantities which are independent of each other