layout l_p_u_man
	code metapost
		def p_u_man(expr pos,mark,txt)(text flags) =
		  T:=identity shifted pos;
		  thdraw((-.25u,0) -- (0,u) -- (0,2u) -- (0,u) -- (.25u,0)
		  
		enddef;
		text en "point u:man" "Person for scale"
	endcode
endlayout