Related Clues:

• Graph line X or Y
• WWII foes
• '13 Pet Shop Boys song about line of rotation?
• Pole-to-pole connection
• x or y follower
• One of three in a 3-D graph
• A big strike upset international alliance
• x or y, on a graph
• x, y or z follower
• Vertical part of a plane
• Japan was a member of it
• x, y or z, on a 3-D graph
• Spinning line for a boundary return
• Starter stolen from hired vehicle's central part
• The Central Line in E London has eleven stops