inter-tropical convergence zone (ITCZ)

tropical trials

mean time between repairs in tropical climate

specified lifetime in tropical climate (years)

time to first overhaul in tropical climate

grid convergence

grid convergence factor

map convergence

convergence

battery angle of convergence

angle-of-attack convergence

angle of convergence

inter-agency cooperation

inter-chart relationship diagram (cart.)

inter-look dormant period (mines)

inter-theatre

Inter-Entity Boundary Line (IEBL)

inter-army flight

Inter-State Aviation Committee (IAC)

inter pulse modulation (IPM)

single inter-operational plan (SIOP)

inter-modulation distortion (IMD)

inter-pupillary distance (IPD)

inter integrated circuit (bus) (I2C / IIC)

grid zone / grid-zone

zone standard time (zone time) (ZST)

killing zone / kill zone

grid zone designation / Grid Zone Designator

grey-zone / grey zone (international relations)

hundred-per-cent zone (one-hundred-per-cent zone)

no-fire zone / no fire zone

flight restriction zone / flight restricted zone (FRZ)

air defense zone