Watch the newsletters because you may find your question featured. I am starting this newsletter with one of my favorite questions - Which was asked by Eric of San Diego, Ca. Well Eric, geometric shapes often show up in the palm and are fun to read.
Triangles are usually signs of good news.
I am assuming that you are speaking of the end of the Line of Saturn that terminates under the middle finger or the Saturn finger. See Figure 7c. Some old palmistry books might tell you some upsetting ideas about this. But, I find that triangles often mean a very good association with other persons that can create good things for and with you. Triangles mean that you find some really good people to help you with goals in this life in the area of the palm they show up.