<Tr> <Td> sound intensity </Td> <Td> watt per square meter (W / m) </Td> </Tr> <Tr> <Td> electric current </Td> <Td> ampere (A) </Td> </Tr> <Tr> <Td> moment of inertia </Td> <Td> kilogram meter squared (kg m) </Td> </Tr> <Tr> <Td> i (\ displaystyle i) </Td> <Td> intensity </Td> <Td> watt per square meter (W / m) </Td> </Tr>

What does the i stand for in physics