Orbit 3 prong black 120-120-120 degree atom represents carbon & can be used to represent molecular hybridization in molecules such as benzene. It can also be seen in our dna helix model & our glow in the dark version dna model.
You can use these Genuine Cochranes of Oxford Orbit Molecular Model Parts to replace missing pieces or augment any of the Orbit Molecular Model Sets & Molecular Model Kits supplied by Indigo Instruments.