At 15:36 29/2/96, John Conway wrote:>On 29 Feb 1996, Dan Bennett asked about naming:
>> A finite straight line has two sides and can be considered a regular >> n-gon where n = 2. (This line is also a rectangle with length, but 0 >> width, an ellipse with one axis = 0, an isosceles triangle with base >> = 0, and so on. In every case it has two sides.) Is there a correct >> "gon" >> term (besides" line segment") for this shape? A bigon? duogon? digon?
Abelson and DiSessa in their "Turtle Geometry" refer to this as a 'bigon', and discuss bigons on the surfaces of cubes and so on - and make the (weak) joke that perhaps we shold let 'bigons be bygones'.