| PFT | Pulse Fourier Transformation |
| DFT | Discrete Fourier Transformation |
| IFT | Inverse Fourier Transformation |
| HFT | Hypercomplex Fourier Transformation |
| DFFT | Double Forward Fourier Transformation |
| FFT | Fast Fourier Transform/Transformation |
| IFFT | Inverse Fast Fourier Transformation |
| sot | Chatsprache: short of time Chat-Kürzel: wenig Zeit |
| Transf. | Transformation |
| Trsf. | Transformation |
| SW | Short Wave |
| VSW | Very Short Wave |
| SCC | Short Circuit Current |
| SDM | Short Data Message |
| SHM | Short Hold Mode |
| ILT | Inverse Laplace Transformation |
| SMS | Short Message Service |
| DWT | Discrete Wavelet Transformation |
| RFT | Rotational Frame Transformation |
| SRD | Short Range Device |
| SWF | Short Wave Fading |
| KKT | Kramers-Kronig Transformation |
| UTF | Unicode Transformation Format [UTF-8, UTF-16, UTF-32] |
| USW | Ultra Short Wave |
| CCT | Continuous Cooling Transformation |
| VFT | Vibrational Frame Transformation |
| FT | Fourier Transform |
| FSD | Fourier Self-Deconvolution |
| FS | Fourier Series |
| FC | Fourier Components |
| FF | Fourier Frequencies |
| TST | Time-Space-Time network |
| CTM | Current Transformation Matrix [PostScript] |
| IDCT | Inverse Discrete Cosine Transformation |
| SWL | Short Wave Laser / Listener |
| SRBM | Short-Range Ballistic Missile Kurzstreckenrakete |
| DCT | Discrete/Direct Cosinus Transformation |
| DSRO | Directional Short Range Order |
| XSLT | Extensible Stylesheet Language Transformation |
| SPES | Short Parkinson Evaluation Scale |
| UTF | Universal character set Transformation Format |
| SIFS | Short Inter Frame Space |
| csro | Chemical Short-Range Order |
| BWT | Burrows Wheeler Transformation [engl.] |
| SMSC | Short Message Service Center |
| VSMSC | Virtual Short Message Center |
| TSRO | Topological Short-Range Order |
| ISWL | International Short Wave League |
| KISS | Chatsprache: Keep it short and simple [engl.] Chat-Kürzel: ...kurz und einfach |
| DCT | Discrete Cosine Transform/Transformation |