IrDA

The initials IRDA can refer to various things:In Information Technology and Communications, IrDA refers to Infrared Data Association, a standard for communication between devices (such as computers, PDAs and mobile phones) over short distances using infrared signals.In medicine, Intermittent rhythmic delta activity, a type of abnormal brain wave.Insurance Regulatory and Development Authority, the administrative agency of Government of India for insurance sector supervision and developmentIskandar Region Development Authority, a key entity to the successful implementation of Iskandar Development Region, Malaysia 
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The Infrared Data Association (IrDA) defines physical specifications  communications protocol standards for the short-range exchange of data over infrared light, for uses such as personal area networks (PANs).IrDA is a very short-range example of free-space optical communication.IrDA interfaces are used in palmtop computers, mobile phones, and laptop computers (many laptops no longer offer IrDA in favor of Bluetooth).IrDA specifications include IrPHY, IrLAP, IrLMP, IrCOMM, Tiny TP, IrOBEX, IrLAN and IrSimple. IrDA has now produced another standard, IrFM, for Infrared financial messaging (i.e., for making payments) also known as "Point & Pay". For the devices to communicate via IrDA they must have a direct line of sight.
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Infrared Data Association

(n.) Tuesday

INFRARED DATA ASSOCIATION. IRDA