Signaling End Point Signalling End Point Spherical Error Probable Somebody Else's Problem Support Enablement Package System Enhancement Program Solar Electric Propulsion Soldier Enhancement Program Simplified Employee Pension Source Evaluation Panel separation September Special Emphasis Program Systems Engineering Plan separate Separation Technologies solar energetic particle Someone Else's Problem Star Epitaxial Planar Supplemental Environmental Project Safety Enhancement Program Search Engine Positioning Senior Executive Program Solar Electric Power Space Electronic Package Space Electronics Package Special Emphasis Panel Standard Engineering Practice standard error of prediction Standard Evaluation Procedures
Signaling End Point
Spherical Error Probable