point
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This would be a line, which has no width, no thickness and no endpoints, but has infinite length.
A line fits this description.
line style
There are typically three words in geometry that are undefined. The first is "point." A point has no dimension, length, width, or thickness. The second is "line." A line has no thickness and goes on indefinitely in both directions. The third undefined term is "plane." A plane has no thickness and has no boundaries.
The ideal line is a concept. A line that is drawn cannot be a mathematically true line since it will have a thickness - no matter how small. Also, it cannot be infinitely long - no matter how large.