| A - B | C - D | E - F | G - H | I - J | K - L | M - N | O - P | Q - R | S - T | U - V | W - X | Y - Z |

Yagi antenna
The most popular type of amateur directional (beam) antenna. It has one driven element and one or more additional elements.

Z
In electrical equations, this is used to mean "Impedance."