There seems to be a misunderstanding. There is no standard laboratory equipment or tool called a "pipestem triangle." It's possible you're thinking of something else, perhaps:

* Clay triangle: This is a common piece of lab equipment used to support crucibles during heating. It's made of a triangular frame of heat-resistant clay, often with a small wire mesh platform in the center.

* Wire gauze: This is a square piece of metal mesh used to spread the heat from a Bunsen burner evenly. A clay triangle can be used to support the wire gauze over the burner flame.

* Tripod: This is a three-legged stand used to support a variety of lab equipment, like beakers, flasks, and other containers during heating or experimentation.

Please provide more context or a more specific description of what you're looking for. This will help me understand your request better and give you the right answer.