“SSTO”是“Single Stage To Orbit”的缩写，意思是“单级

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“SSU”是“Space Station Utilization Office”的缩写，意

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“SSUS”是“Spinning Solid Upper Stage”的缩写，意思是“

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“SSUS-A”是“Spinning Solid Upper Stage for Atlas

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“SSUS-D”是“Spinning Solid Upper Stage for Delta

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“ISB”是“Illinois State Bar”的缩写，意思是“伊利诺伊

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“SSUSP”是“Spinning Solid Upper Stage Project”的缩

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“ISB”是“Indiana State Bar”的缩写，意思是“印第安纳州

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“SSV”是“Space Shuttle Vehicle”的缩写，意思是“航天飞

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“ST”是“Self Test”的缩写，意思是“自测试”

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