Glossary of Terms
 
  1/8-inch plug  
  A 1/8-inch male connector commonly used with consumer electronics; A mono 1/8-inch plug uses two conductors (tip/sleeve), and a stereo 1/8-inch plug uses three conductors (tip/ring/sleeve).  
  Source: Yamaha  

Also refered as:
  miniplug
Related terms:
  1/8-inch jack   TRS   TS   minijack   miniplug