Definition of "three-pin" []

• Baldwin I 1058-1118. King of Jerusalem (1100-1118) who was appointed to the throne after taking part in the First Crusade (1096-1099).

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The three-pin sight, for example, has pins that are .029, .019, and .10 inch diameter."
• "Other features include a micro push-button LED light (illegal in some states – check first!), a lightweight housing, and a large circular field of view. $89 for the three-pin, $99 for the five-pin."
• "He uses rows of three-pin sockets plugged into a diesel generator."