[Rd] Rotated Triangles at pch 26 and 27

[ivo welch]

I believe pch=26 and 27 are not used.

suggestion: low priority but would be nice:  the other symbols are pch
symmetric.  the triangles do not have 90 degree rotated equivalents.

use case: the triangle makes a nice way, e.g., to indicate a mean (at the
box bottom) for the x axis pointing upways.  there is no triangle for the
mean for the y axis to point sideways.

--
Ivo Welch (ivo.welch using ucla.edu)

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