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A Swedish 84 mm unguided, man-portable, disposable, shoulder-fired recoilless anti-tank weapon built by Saab Bofors Dynamics. AT4 is not considered a rocket launcher as the explosive warhead is not propelled by a rocket motor; similarly, it is not exactly a rocket launcher, but rather a recoilless gun, as the launcher is smoothbore and not rifled. The M136 AT4 is a variant used by the US Army.
The name AT4 is a word play on the 84 mm caliber of the weapon. 'Eighty four' being a homophone of 'A-T-4'. The name also doubles as an alpha-phonetic word play on the weapon's role due to "AT" being a common military abbreviation for "Anti-Tank".
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This tag implicates rocket_launcher (learn more).