Search Engine Optimization 
Search engine optimisation 
Special Engineering Order 
Satellite for Earth Observation 
Senior Education Officer 
Special Equipment Option 
Subtransfer Earth Orbit 
Synchronous Equatorial Orbiter 
Satellite Engineering Officer 
science and education outreach 
Search Engine Optimizer 
Selcon Airlines 
Seleninyl 
Senior Engineering Officer 
Senior Executive Officer 
Seoul 
side entry orifice 
sniper employment officer 
Society of Education Officers 
Socio-Economic Objective 
Software Executive Official 
source election official 
Special Exemption Order 
State Engineer's Office 
Stora Enso Oyj 
Student Employment Office 
Support Enforcement Officer 
Survivability Enhancement Option 
Survivability Enhancement Options 
Synchronous Equatorial Orbit