Arrow

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Arrow[{$p_1$, $p_2$}]

represents a line from $p_1$ to $p_2$ that ends with an arrow at $p_2$.

Arrow[{$p_1$, $p_2$}, s]

represents a line with arrow that keeps a distance of s from $p_1$ and $p_2$.

Arrow[{$point_1$, $point_2$}, {$s_1$, $s_2$}]

represents a line with arrow that keeps a distance of $s_1$ from $p_1$ and a distance of $s_2$ from $p_2$.

Arrow[{$point_1$, $point_2$}, {$s_1$, $s_2$}]

represents a line with arrow that keeps a distance of $s_1$ from $p_1$ and a distance of $s_2$ from $p_2$.

Arrows can also be drawn in 3D by giving point in three dimensions:

Keeping distances may happen across multiple segments:

AbsoluteThickness
Arrowheads