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Good point...sankaku means triangle in Japanese. But the rear naked choke (mata leao in Portguese) I believe is actually called Hadaka Jime in Japanese. Hadaka means naked. Juji means "cross" which is why the armbar (armeloque in Portuguese) is called "Juji Gatame".
You got it--Rear naked choke=Hadaka Jime( So named as it's the one major choke in Judo which uses no part of the gi for leverage).
Juji-jime has 3 or so variations as to hand placement but it's the one where you use the gi collars with both hands/elbows in a front cross choke( hence "Juji-Jime").