Template:Base quantities and count

Base quantity	Symbol for quantity	Symbol for dimension	Name of SI unit	Symbol for SI unit
length	l	L	meter	m
mass	m	M	kilogram	kg
time	t	T	second	s
electric current	I	I	ampere	A
thermodynamic temperature	T	Θ	kelvin	K
amount of substance	n	N	mole	mol
luminous intensity	Iv	J	candela	cd
count; number of entities*	NX	C	counting unit	x

* 'Count' is synonymous with 'number of entities' and is one of the most fundamental quantities in physics, but the name, symbol and unit are not included in the SI as a base quantity or base unit. An 'entity' is a countable object or event. 'Number of entities' and 'number' are different (in German: Anzahl versus Zahl). The count is not a pure dimensionless number: the dimension is the countable object or entity; the 'counting unit' [x] indicates how many times different members of the defined entity re-occur in a defined system (not how many times the same member of the defined entity is re-counted), or how many times a defined event (which is an entity) occurs over a defined period of time.