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5 relations: ITU-T, Northrop X-21, S-400 missile system, X.21, X21 (band).
ITU-T
The ITU Telecommunication Standardization Sector (ITU-T) is one of the three sectors (divisions or units) of the International Telecommunication Union (ITU); it coordinates standards for telecommunications.
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Northrop X-21
The Northrop X-21A was an experimental aircraft designed to test wings with laminar flow control.
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S-400 missile system
The S-400 Triumf (C-400 Триумф, Triumph; NATO reporting name: SA-21 Growler), previously known as the S-300PMU-3, is an anti-aircraft weapon system developed in the 1990s by Russia's Almaz Central Design Bureau as an upgrade of the S-300 family.
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X.21
X.21 (sometimes referred to as X21) is an interface specification for differential communications introduced in the mid-1970s by the ITU-T. X.21 was first introduced as a means to provide a digital signaling interface for telecommunications between carriers and customers' equipment.
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X21 (band)
is a Japanese girl idol group.
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