1 Girls start having periods at different times depending on how quickly they are developing.  If a girl has not had her first period by the time she is 16, this is still probably normal, but it would be worth checking with a doctor.
IETMS stands for Interactive Electronic Technical Manual System. Israeli English Teachers' Network. Institution of Engineering and Technology Northern Ireland. Institute of Engineering Technology of Ontario (Canada) Interagency Environmental Technology Office (Washington, DC) Industrial Effluent Treatment Plant.
IED is the abbreviation for an Improvised Explosive Device. An IED is usually a makeshift bomb that can be extremely destructive when detonated. There are many different variations of the IED and they are sometimes used as a distracting tactic before another form of attack. These types of bombs are often used in guerrilla warfare.