{tikz-arrows} is about questions related to the arrow head specifications in the arrows library of the TikZ/PGF graphics package. If the question is not specifically addressing an issue related to the arrow construction, use the general {tikz-pgf} tag.

In TikZ/PGF package, one can find the Arrow Tip library for a variety of custom arrow heads. To be able to utilize these extra arrowheads, the following line


should be added to the preamble. Then the arrowheads can be used in the TikZ pictures with, for example,

\draw[right hook reversed-open diamond] (0,0) -- (2,2);

which results in

enter image description here

See Tikz/PGF manual for more comprehensive details.