intelligence quotient; IQ
discomfort index; temperature-humidity index
stock index; stock market index; stock price index
consumer price index; CPI
composite index (stock exchange); aggregate index; all-items index; CI
laundry index (indicating how suitable the weather is for drying clothes)
industrial production index; IPI
pH; (lit.) hydrogen ion exponent
fear index; volatility index
wholesale price index; WPI
exponent portion; characteristic (e.g. in floating-point representation)
diffusion index; DI; business sentiment index
colour index; color index
characteristic of a logarithm
index of capacity utilization ratio; ICUR; capacity utilization index; operating rate index
business index; business barometer
consumer confidence index; CCI; consumer attitude index
wet bulb globe temperature index; WBGT index; heat stress index
ultraviolet index; UV index