S&H - Safety and Health 
S-AMS - Surface - Air Management Syste… 
S/SIS - Sales/Service Information Syst… 
S/T - Source/Type Code 
S3 - Sales Support Solution 
SA - Supporting Annexes 
SADI - Supplier Automated Database on… 
SAFR - Standard Accounting For Retail 
SAIC - Science Applications Internatio… 
SAM - Space Available Mail 
SAMS - Stockroom Analysis and Measures… 
SAMS - Surface Air Management System 
SAPMG - Senior Assistant Postmaster Ge… 
SAR - Secondary Address Readers 
SASS - Surface-Air Support System 
SASWYB - Semi-Automatic Scan-Where-You… 
SATO - Scheduled Airline Ticket Office 
SAVE - Standardized Acceptance and Ver… 
SBCS - Sack Bar Code Scanner 
SBM - Stamps By Mail 
SC - Sorting Carriage 
SC - South Carolina 
SCAN - Shipment Confirmation Acceptanc… 
SCC - Small Currency Changer 
SCC - Sorter Control Computer 
SCC - System Control Console 
SCD - Saving Certificate Division 
SCF - Sectional Center Facility 
SCM - Stamp Cancelling Machine 
SCM - Supply Chain Management