Å	Ångström (10−10 m, used for structural resolution/length)
BSA	Buried Surface Area
°C	Degrees Celsius
CDR	Complementarity-Determining Region
Cryo-EM	Cryogenic Electron Microscopy
CTF	Contrast Transfer Function
DDM	n-Dodecyl β-D-maltoside
Env	Envelope Glycoprotein
Fab	Fragment Antigen-Binding
FACS	Fluorescence-Activated Cell Sorting
FP	Fusion Peptide
FR	Framework Region
HIV	Human Immunodeficiency Virus
IC50/ IC80	Concentration of Antibody Required to Inhibit 50%/80% of Infection
ID50	Inhibitory Dilution Required to Inhibit 50% of Infection
KD	Equilibrium Dissociation Constant
ka	Association Rate Constant
kd	Dissociation Rate Constant
LD	Linear Dichroism
mg/mL	Milligrams per Milliliter (Concentration Unit)
µg/mL	Micrograms per Milliliter (Concentration Unit)
µL	Microliter (10−6 L)
µM	Micromolar (10−6 Molar Concentration)
nM	Nanomolar (10−9 Molar Concentration)
NGS	Next-Generation Sequencing
PDB	Protein Data Bank
RU	Response Units (Surface Plasmon Resonance Readout)
SHIV	Simian–Human Immunodeficiency Virus
SHM	Somatic Hypermutation
SPR	Surface Plasmon Resonance
SSM	Site-Saturation Mutagenesis
VH	Variable Heavy Chain
VL	Variable Light Chain