Bicone

A bicone is a shape that looks like two cones stuck together at their wide ends. It's like when you take two ice cream cones and glue them together, but the bicone is usually made of something harder like glass or crystal.

People use bicones in all kinds of things, like jewelry or decorations. They're often pretty small, so if you see them in a necklace or bracelet, there might be a lot of them all lined up next to each other.

The reason people like bicones is because they can reflect light and make the thing they're in look extra shiny and sparkly. It's kinda like when you hold up a disco ball and the light from the dance floor bounces off all the tiny mirrors and fills the room with cool sparkles.

Overall, bicones are just a fancy shape that people like to use because they make things look cool and shiny.