| Acronym | Meaning |
 | JRB | Joint Review Board |
| JSC | Johnson Space Center |
| JSL | Jet Select Logic |
| JSLWG | Joint Spacelab Working Group |
| JST | Joint Systems Test |
| JTA | Job Task Analysis |
| JTG | Joint Training Group |
| JURG | Joint Users Requirements Group |
| K | Kelvin |
| K | Kilo (1000) |
| K | Kilocycle |
| K | One Thousand |
| K&H | Memory Time Value |
| K-APM | KSC Automated Payloads Plan/Requirement |
| K-APN | KSC Automated Payloads Notice |
| K-APPS | KSC Automated Payloads Project Specification |
| K-CITEM | KSC CITE Plan/Requirement |
| K-DODM | KSC DOD Plan/Requirement |
| K-DPM | KSC DOD Payloads Plan/Requirement |
| K-DPN | KSC DOD Payloads Notice |
| K-DPPS | KSC DOD Payloads Project Specification |
| K-IUSM | KSC IUS Plan/Requirement |
| K-IUSN | KSC [US Notice |
| K-IUSPS | KSC IUS Project Specification |
| K-MMSEM | KSC MMSE Plan/Requirement |
| K-MMSEN | KSC MMSE Notice |
| K-MMSEPS | KSC MMSE Project Specification |
| K-SLM | KSC Spacelab Plan/Requirement |
| K-SLN | KSC Spacelab Notice |
| K-SLPS | KSC Spacelab Project Specification |
| K-SM | KSC Shuttle Management Document |
| K-SPN | KSC Shuttle Project Notice |
| K-SPS | KSC Shuttle Project Specification |
| K-SSS | KSC Shuttle Project Station Set Specification |
| K-STSM | KSC STS Plan/Requirement |
| K-STSN | KSC STS Notice |
| K-STSPS | KSC STS Project Specification |
| K/S | Kick Stage |
| KAD | Kadena AB |
| KAPL | KSC Approved Parts List |
| KATS | Kennedy Avionics Test Set |
| KAU | Kilo Accounting Unit |
| KB | Keyboard |
| KB | Kilobit |
| KBAC | Kennedy Booster Assemblv Contractor |
| KBIM | Keyboard Interface Module |
| KBPS | Kilobits Per Second |
| KBPS | Kilobits Per Second |
| KBU | Keyboard Unit |
| KCAL | Kilocalorie |
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