IQ also stands for...

Indefinite Quantity contract
Iraq (country code, top level domain)
Information Quality
Image Quality
Installation Qualification
Intelligent Question
Irrelevant Question (polygraphy)
Inverse Quantization
Inhibitory Quotient
In-phase/Quadrature
Issue Queue
Indication of Quality (Nortel)
Indy Quotient (computer game score)
Input Queuing