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/usr/share/gmt/custom/trirot2.def is in gmt-common 5.3.1+dfsg-2.

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#	$Id: trirot2.def 12822 2014-01-31 23:39:56Z remko $
#
#	Definition file for 90-degree triangle symbol (2nd quadrant).  Use in psxy
#	as -Sktrirot2/size.  Can be circumscribed by the square.
#
-0.353553391	-0.353553391	M
0.353553391	-0.353553391	D
0.353553391	0.353553391	D