What does |AM|=|AC| mean?

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What does $$|AM|=|AC|$$ mean? $$AM$$ and $$AC$$ are rays. Do they mean the length or what?

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Generally, If $X$ and $Y$ are any two points in a euclidean space, then $|XY|$ means the distance between $X$ and $Y$, while $XY$ refers to the line segment between $X$ and $Y$ (inclusive). At one time, people would use the same notation, $XY$, for both meanings, leaving what is meant to be worked out from the context. It is recommended to use the modern and precise notation for clarity.