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X(3), X(4), X(6), X(15), X(16), X(23), X(2574), X(2575), X(7712) Q1, Q2, Q3 : vertices of the Thomson triangle Ka, Kb, Kc : vertices of the tangential triangle foci of the inconic with center X(141) Ua*, Ub*, Uc* as in the page K001 isogonal conjugates of the vertices of the pedal triangle of X(3) wrt the antimedial triangle antipoints, see Table 77 

Q136 is a circular quartic with singular focus X(23) and with two real asymptotes which are the parallels at X(858) to those of the Jerabek hyperbola. It is related to stelloidal pentagonal circumquartics. See Q125 and specially Q132. Q136 is the 4th polar of O in Q037. See also Q139. See here for a locus property in Spanish (Angel Montesdeoca, 20191110). 
