In geometry, a line and a ray are different concepts. A line extends infinitely in both directions, while a ray starts at one point and extends infinitely in one direction.
If "LM" refers to a line segment between points L and M, it would typically be called a line segment, not a ray. If you're specifically referring to a ray that starts at point L and passes through point M, then it would be referred to as ray LM, often denoted as \( \overrightarrow{LM} \) or similar notation.
Could you provide more context or clarify what you mean by "LM" so I can assist you better?