| +R | π-electron acceptor/donor group |
| 3D-QSAR | comparative molecular field analysis (CoMFA) 3D-QSAR (three-dimensional quantitative structure–activity relationships) |
| A | nucleotide bases |
| ACGIH | threshold limit value (TLV) |
| ADMR | ADMR ODMR (Optically Detected Magnetic Resonance) |
| AMR | attractive–mixed–repulsive
(AMR) classification |
| ANN | artificial neural networks pattern recognition |
| ATP | catabolism yield,
in biotechnology |
| BAPMoN | air monitoring station in atmospheric chemistry |
| BET | microporous carbon |
| BSE | back scattered electrons
(BSEs)
in in situ microanalysis |
| BSEs | back scatter coefficient in in situ microanalysis |
| BSS | Rutherford backscattering (RBS) |
| C | nucleotide bases |
| CADD | computer-assisted drug design (CADD) |
| CAMD | computer-assisted molecular design (CAMD) |
| CAMM | computer-assisted molecular modeling (CAMM) |
| CCD | charge-transfer device in radiation detection |
| CCN | condensation nuclei (CN) in atmospheric chemistry |
| CD | chiroptic/chiroptical circular dichroism (CD) |
| cDNA | cDNA complementary DNA
(cDNA) |
| CEM | photomultiplier tube |
| CI | configuration interaction (CI) |
| CID | charge-transfer device in radiation detection |
| CIDEP | CIDEP (Chemically Induced Dynamic Electron
Polarization)
|
| CIDNP | chemically induced dynamic nuclear polarization
(CIDNP)
CIDNP (Chemically Induced Dynamic Nuclear
Polarization)
radical pair (geminate pair) stimulated emission |
| CIEEL | CIEEL (Chemically Initiated Electron Exchange
Luminescence)
|
| CIP | CIP priority priority Re, Si |
| CIPM | millimetre of mercury |
| CMP | chemical measurement process (CMP) |
| CN | condensation nuclei (CN) in atmospheric chemistry |
| CoMFA | comparative molecular field analysis (CoMFA) |
| CPL | chiroptic/chiroptical |
| CRU | constitutional repeating unit
(CRU) in polymers |
| CT | charge-transfer
(CT) state charge-transfer (CT) transition CT |
| CTTS | charge transfer transition to solvent
(CTTS) |
| CVD | CVD diamond diamond by CVD gas-phase-grown carbon fibres pyrolytic carbon synthetic graphite |
| CVTST | canonical variational transition-state theory
(CVTST)
|
| CW | argon ion laser CW dye laser ion laser solid state lasers time-correlated single photon counting tunable laser in spectrochemical analysis |
| DEDMR | DEDMR ODMR (Optically Detected Magnetic Resonance) |
| DFDMR | DFDMR ODMR (Optically Detected Magnetic Resonance) |
| DLC | diamond-like carbon films |
| DN | donor number (DN) |
| DNA | blotting in biotechnology cDNA chromosome clone complementary DNA
(cDNA) deoxyribonucleic acids (DNA) DNA DNA probe exon expression in biotechnology gene library gene manipulation genome histones hybridization |
| DSC | differential scanning calorimetry (DSC) |
| DTA | differential thermal analysis (DTA) |
| ECL | electrogenerated chemiluminescence (ECL) |
| EES | excitation-emission spectrum |
| EGA | evolved gas analysis (EGA) |
| EGD | evolved gas detection (EGD) |
| ELISA | immunoassay |
| emf | membrane emf |
| EPMA | electron probe microanalysis (EPMA) |
| EPR | coupling constant (spin-spin),  electron paramagnetic resonance (EPR) magnetic resonance imaging (MRI) spin density |
| EPXMA | electron probe X-ray microanalysis (EPXMA) |
| ESCA | electron spectroscopy for chemical analysis (ESCA) ESCA photoelectron spectroscopy (PES) X-ray photoelectron spectroscopy (XPS) |
| ESR | CIDEP (Chemically Induced Dynamic Electron
Polarization)
electron paramagnetic resonance (EPR) spin density spin label |
| ev | bioavailabilty in pharmacokinetics |
| EXAFS | extended X-ray absorption fine structure (EXAFS) |
| FAB | fast-atom bombardment (FAB) mass spectroscopy |
| FDMR | ODMR (Optically Detected Magnetic Resonance) |
| FET | phototransistor |
| FT-ICR | Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometer
|
| FT-MS | Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometer
|
| FTS | multiplex spectrometer |
| FVP | flash vacuum pyrolysis (FVP) |
| FWHM | FWHM (Full Width at Half Maximum) half-width of a band line width resolution in mass spectroscopy |
| G | nucleotide bases |
| GC | gas chromatography (GC) |
| GPC | exclusion chromatography |
| H | immunoglobulin (Ig) |
| HBA | protophilic (solvent) |
| HETP | plate height,
in chromatography |
| HM | carbon fibres type HM
pitch-based carbon fibres |
| HOMO | frontier orbitals homo subjacent orbital |
| HOPG | highly oriented pyrolytic graphite polycrystalline graphite pyrolytic graphite |
| HPLC | liquid chromatography (LC) |
| HRELS | high resolution energy loss spectroscopy (HRELS) |
| HT | carbon fibres type HT carbon fibres type IM |
| HWHM | HWHM (Half Width at Half Maximum) line width |
| IC | ion-exchange chromatography |
| ICR | Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometer
ion cyclotron resonance (ICR) mass spectrometer |
| ICVTST | improved canonical variational transition-state theory
(ICVTST)
|
| Ig | immunoglobulin (Ig) |
| IHP | inner Helmholtz plane (IHP) |
| IM | carbon fibres type IM |
| IPMA | ion probe microanalysis (IPMA) |
| IPN | interpenetrating polymer network (IPN) |
| IR | degree of crystallinity of a polymer photochemistry |
| ISE | ion-selective electrode (ISE) |
| ISO | millimetre of mercury substance content,
substance flow rate substance fraction,
transport number,
|
| ISS | ion scattering spectrometry (ISS) |
| IUPAC | mercaptans |
| iv | bioavailabilty in pharmacokinetics |
| JECFA | acceptable daily intake ( ) |
| L | immunoglobulin (Ig) |
| LAMES | laser micro emission spectroscopy
(LAMES)
|
| LAMMS | laser micro mass spectrometry
(LAMMS) |
| LB | Langmuir–Blodgett (LB) membrane |
| LC | lethal concentration liquid chromatography (LC) |
| LD | lethal dose |
| LEED | low energy electron diffraction (LEED) |
| LEP | London–Eyring–Polanyi (LEP) method |
| LEPS | London–Eyring–Polanyi–Sato (LEPS) method |
| LIDAR | LIDAR in atmospheric chemistry |
| LLCT | ligand to ligand charge transfer (LLCT) transition |
| LM | carbon fibres type LM pitch-based carbon fibres |
| LMCT | ligand to metal charge transfer (LMCT) transition |
| LOAEL | lowest-observed-adverse-effect-level (LOAEL) lowest observed adverse effect level (LOAEL) |
| LOEL | lowest-observed-effect-level (LOEL) |
| LRMA | laser Raman microanalysis (LRMA) |
| LUMO | frontier orbitals LUMO |
| M |
P, M
|
| MAbs | monoclonal antibodies (MAbs) |
| MCD | magnetic circular dichroism (MCD) |
| MCPLC | disruptor rigid chain spacer |
| MLCT | metal to ligand charge transfer (MLCT) transition MLCT |
| MLR | regresssion analysis |
| MMCT | metal to metal charge transfer (MMCT) transition |
| MOS | charge-transfer device in radiation detection |
| MPL | maximum permissible level (MPL) |
| MPP | mesophase pitch-based carbon fibres MPP-based carbon fibres pitch-based carbon fibres rayon-based carbon fibres |
| MRI | magnetic resonance imaging (MRI) |
| mRNA | enzyme repression expression in biotechnology gene (cistron) genetic code |
| MSDS | material safety data sheet (MSDS) |
| MTC | maximum tolerable concentration (MTC) |
| MTD | maximum tolerable dose (MTD) maximum tolerated dose (MTD) |
| MTEL | maximum tolerable exposure level (MTEL) |
| NEXAFS | extended X-ray absorption fine structure (EXAFS) |
| NHOMO | NHOMO subjacent orbital |
| NIH | NIH shift |
| NMR | aromatic chemical shift, in NMR CIDNP (Chemically Induced Dynamic Nuclear
Polarization)
coupling constant (spin-spin),  magnetic resonance imaging (MRI) magnetization transfer structure-based design in drug design |
| NOAEL | no observed adverse effect level (NOAEL) no-observed-adverse-effect-level (NOAEL) |
| NOEL | no-observed-effect-level (NOEL) |
| ODMR | ADMR DEDMR DFDMR ODMR (Optically Detected Magnetic Resonance) PDMR |
| OHP | outer Helmholtz plane (OHP) |
| ORD | chiroptic/chiroptical |
| OSHA | material safety data sheet (MSDS) |
| P |
P, M
|
| p.d. | potential-determining (p.d.) ions |
| p.z.c. | point of zero charge (p.z.c.) potential at the point of zero charge (p.z.c.) |
| PA | proton affinity |
| PAN | PAN-based carbon fibres rayon-based carbon fibres |
| PC | planar chromatography |
| PCA | pattern recognition |
| PCR | polymerase chain reaction (PCR) |
| PDMR | ODMR (Optically Detected Magnetic Resonance) PDMR |
| pe | primary electrons (pe)
in in situ microanalysis |
| PES | photoelectron spectroscopy (PES) |
| pfhs | precipitation from homogeneous solution
(pfhs)
in analysis |
| PIN | photodiode PIN (p-intrinsic-n) diode PIN semiconductor detector |
| PIXE | characteristic X-ray emission |
| PLOT | porous-layer open-tabular (PLOT) column
in chromatography support-coated open-tubular (SCOT) column
in chromatography |
| PLS | partial least squares (PLS) pattern recognition regresssion analysis |
| PTFE | bomb-digestion in spectrochemical analysis |
| PVC | interfering substance
in electroanalytical chemistry |
| PVD | pyrolytic carbon |
| QCT | quasi-classical trajectory (QCT) method |
| QSAR | correlation analysis QSAR quantitative structure–activity relationships (QSAR) quantitative structure–activity relationship (QSAR) in drug design |
| R | R, S |
| r | r, s |
| R* | R*, S* |
| RBS | Rutherford backscattering (RBS) |
| REELS | high resolution energy loss spectroscopy (HRELS) reflection electron energy loss spectroscopy (REELS) |
| RfD | reference dose (RfD) |
| RHEED | reflection high energy electron diffraction (RHEED) |
| RIA | immunoassay |
| RNA | blotting in biotechnology complementary DNA
(cDNA) hybridization |
| Rp | Rp, Sp |
| RP-HPLC | lipophilicity |
| RRK | Rice–Ramsperger–Kassel (RRK) theory Rice–Ramsperger–Kassel–Marcus (RRKM) theory |
| RRKM | Rice–Ramsperger–Kassel–Marcus (RRKM) theory |
| RS | racemate RS |
| RYDMR | ODMR (Optically Detected Magnetic Resonance) |
| S | R, S |
| s | r, s |
| S* | R*, S* |
| SAED | selected area electron diffraction (SAED) transmission high energy electron diffraction
(THEED)
|
| SAR | structure–activity relationship (SAR) |
| SCOT | support-coated open-tubular (SCOT) column
in chromatography |
| SCP | single cell protein (SCP) |
| SEC | size-exclusion chromatography (SEC) |
| SEM | scanning electron microscopy (SEM) |
| SET | single-electron transfer mechanism (SET) |
| SFC | supercritical fluid chromatography (SFC) |
| SGPLC | spacer |
| SI | system of units of measurement |
| SIMCA | pattern recognition |
| SIMS | ion microscopy |
| SIPN | semi-interpenetrating polymer network (SIPN) |
| SIX | solvent ion exchange (SIX) |
| SLUMO | subjacent orbital |
| SMILES | SMILES |
| SOMO | SOMO |
| Sp | Rp, Sp |
| SPC | quantitative structure–activity relationship (QSAR) in drug design structure-property correlations (SPC) |
| SR | racemate |
| STEL | threshold limit value (TLV) |
| STEM | scanning transmission electron microscopy (STEM) |
| STP | STP |
| T | nucleotide bases |
| TAC | time-correlated single photon counting |
| TEELS | transmission electron energy loss spectroscopy
(TEELS)
|
| TEM | electron microscopy scanning transmission electron microscopy (STEM) transmission electron microscopy (TEM) |
| TG | thermogravimetry (TG) |
| THEED | selected area electron diffraction (SAED) transmission high energy electron diffraction
(THEED)
|
| TICT | TICT emission TICT state twisted internal charge transfer (TICT) |
| TLC | lipophilicity planar chromatography |
| TLV | threshold limit value (TLV) |
| TRMC | time-resolved microwave conductivity (TRMC) |
| TST | generalized transition-state theory |
| TWA | threshold limit value (TLV) |
| U | nucleotide bases |
| UHM | carbon fibres type HM
carbon fibres type UHM |
| UPS | photoelectron spectroscopy (PES) UV photoelectron spectroscopy (UPS) |
| UV | excimer laser photochemistry photodegradation photoelectron spectroscopy (PES) UV dose UV photoelectron spectroscopy (UPS) UV stabilizer |
| UV–VIS | low temperature UV–VIS absorption spectroscopy |
| W/O/W | lipid film |
| WCOT | wall-coated open-tubular (WCOT) column
in chromatography |
| WMO | air monitoring station in atmospheric chemistry |
| XPS | photoelectron spectroscopy (PES) XPS X-ray photoelectron spectroscopy (XPS) |
| YAG | YAG |
| µVTST | microcanonical variational transition-state theory
(µVTST)
|
| −R | π-electron acceptor/donor group |