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Interventional radiology (IR): Interventional radiologists employ image guidance methods to gain access to the deep interstices of most organs and organ systems. Through a galaxy of techniques, they can treat certain conditions percutaneously (through the skin) that might otherwise require surgery. (The technology includes the use of balloons, catheters, microcatheters, stents, therapeutic embolization (deliberately clogging up a blood vessel), etc.) The specialty of interventional radiology is growing and becoming increasingly diverse.
Sun Microsystems keyboard, which labels the key as Alt Graph. The meaning of the key's abbreviation is not explicitly given in many IBM PC compatible technical reference manuals. However, IBM states that AltGr is an abbreviation for alternate graphic, and Sun keyboards label the key as Alt Graph. AltGr was originally introduced as a means to produce box-drawing characters, also known as pseudographics, in text user interfaces.