常用英語, 一般用 pin
Please refer to the following quote:
The two most common types of fluorescent bulb models have either a single-pin base or a bi-pin base. Single-pin types have only one pin sticking out from either end of the fluorescent bulb, and are typically used for lower-wattage applications. Bi-pin base models have two pins sticking out from either end, and are most commonly used for higher-wattage applications.
http://www.ehow.com/how_5085277_replace-fluorescent-light-tube.html