Electric letter symbols are used in electrical engineering and physics to represent various physical quantities, components, and concepts. Here is a list of common electric letter symbols and their meanings:

**I**: Electric Current. Measured in amperes (A).**V**: Voltage or Electric Potential Difference. Measured in volts (V).**R**: Resistance. Measured in ohms (Ω).**C**: Capacitance. Measured in farads (F).**L**: Inductance. Measured in henrys (H).**P**: Power. Measured in watts (W).**Q**: Electric Charge. Measured in coulombs (C).**E**: Electromotive Force (EMF) or Electric Field. EMF measured in volts (V); Electric Field measured in volts per meter (V/m).**B**: Magnetic Flux Density. Measured in teslas (T).**Z**: Impedance. Measured in ohms (Ω).**Y**: Admittance. The reciprocal of impedance, measured in siemens (S).**S**: Electric Conductance. Measured in siemens (S).**G**: Conductance, often used interchangeably with S. Measured in siemens (S).**F**: Frequency. Measured in hertz (Hz).**W**: Energy or Work. Measured in joules (J).**H**: Magnetic Field Strength. Measured in amperes per meter (A/m).**D**: Electric Displacement Field. Measured in coulombs per square meter (C/m²).**K**: Dielectric Constant or Relative Permittivity of a material.**T**: Period of time or Time constant in circuits. Measured in seconds (s).**Φ**(Phi): Magnetic Flux. Measured in webers (Wb).

These symbols form the basis of electrical and electronic formulae and equations, allowing engineers and scientists to communicate complex information efficiently and accurately.