| Symbol | Definition | Section |
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| degrees Celsius | ||
| degrees Fahrenheit | ||
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| less than or equal to | ||
| percent | ||
| pi | ||
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| square root AC: Advisory Circular AND: Air Force-Navy aeronautical design ASME: The American Society of Mechanical Engineers CRES: corrosion-resistant steel dB: decibel Eq.: equation EVA: extravehicular activity FAA: Federal Aviation Administration FEA: finite element analysis FFRDC: Federally Funded Research and Development Center GSE: ground support equipment HDBK: Handbook Hz: Hertz in: inch(es) ksi: kilopound per square inch lb: Pound(s) LIF: load-introduction factor MEK: Methyl ethyl ketone MIL: Military MSFC: Marshall Space Flight Center |
NAS: National Aerospace Standard NASA: National Aeronautics and Space Administration NASM: National Aerospace Standard (Metric) NPR: NASA Procedural Requirements NSTS: National Space Transportation System PWA: Printed wiring assembly SAE: Society of Automotive Engineers SI: Système International STD: Standard T: nominal effective torque TFSR: Threaded Fastening Systems Requirement