S †
- SAR(Search and Rescue)
- SAR (Specific Absorption Rate)
- SHF(Super High Frequency)
- SHFテレビジョン放送 (Super High Frequency Television Broadcasting)
- SIMカード識別番号 (SIM Card Identification Number)
- SNR(Signal to Noise Ratio)
- SP信号 (Scattered Pilot Signal)
- SPシンボル (Scattered Pilot Symbol)
- SSB通信方式(Single Side Band Communication System)
- SSR(Secondary Surveillance Rader:二次監視レーダ)
- SSRモードS(Secondary Surveillance Radar Mode S)
- Sバンド(S Band)