SI - 7 Base Units

Unit Name	Unit Symbol	Quantity Name	Quantity Symbol	Dimension Symbol	This figure displays the fundamental SI units and the combinations that lead to more complex units of measurement
meter	𝑚	length	I, x, r	L
kilogram	𝑘𝑔	mass	m	M
second	𝑠 or 𝑠𝑒𝑐	time	t	T
ampere	𝐴	electric current	I	I
kelvin	𝐾	thermodynamic temperature	T	Θ
candela	𝑐𝑑	luminous intensity	I_v	J
mole	𝑚𝑜𝑙	amount of substance	n	N

SI - Defining Constants

Symbol	Defining constant	Exact value
Δν_Cs	hyperfine transition frequency of Cs	9192631770 Hz
c	speed of light	299792458 m/s
h	Planck constant	6.62607015×10⁻³⁴ J⋅s
e	elementary charge	1.602176634×10⁻¹⁹ C
k	Boltzmann constant	1.380649×10⁻²³ J/K
N_A	Avogadro constant	6.02214076×10²³ mol⁻¹
K_cd	luminous efficacy of 540 THz radiation	683 lm/W

Prefix		Base 10	Decimal	Adoption
Name	Symbol	Base 10	Decimal	Adoption
		10³⁶	1000000000000000000000000000000000000		undecillion
		10³³	1000000000000000000000000000000000		decillion
quetta	Q	10³⁰	1000000000000000000000000000000	2022	nonillion
ronna	R	10²⁷	1000000000000000000000000000	2022	octillion
yotta	Y	10²⁴	1000000000000000000000000	1991	septillion
zetta	Z	10²¹	1000000000000000000000	1991	sextillion
exa	E	10¹⁸	1000000000000000000	1975	quintillion
peta	P	10¹⁵	1000000000000000	1975	quadrillion
tera	T	10¹²	1000000000000	1960	trillion
giga	G	10⁹	1000000000	1960	billion
mega	M	10⁶	1000000	1873	million
kilo	k	10³	1000	1795	thousand
hecto	h	10²	100	1795
deca	da	10¹	10	1795
		10⁰	1	—
deci	d	10⁻¹	0.1	1795
centi	c	10⁻²	0.01	1795
milli	m	10⁻³	0.001	1795
micro	μ	10⁻⁶	0.000001	1873
nano	n	10⁻⁹	0.000000001	1960
pico	p	10⁻¹²	0.000000000001	1960
femto	f	10⁻¹⁵	0.000000000000001	1964
atto	a	10⁻¹⁸	0.000000000000000001	1964
zepto	z	10⁻²¹	0.000000000000000000001	1991
yocto	y	10⁻²⁴	0.000000000000000000000001	1991
ronto	r	10⁻²⁷	0.000000000000000000000000001	2022
quecto	q	10⁻³⁰	0.000000000000000000000000000001	2022