The term arachnid is from Greek and means spider. Arachnids have four pairs of legs.
There are over 100,000 named species, including spiders, scorpions, harvestmen, ticks, and mites.
In an industrial or manufacturing context, "arachnids, spiders" may refer to robots or machines that are designed to move and function in a manner similar to spiders. These machines may be used for a variety of tasks, such as inspection, maintenance, or material handling. They may be equipped with sensors and other technologies to allow them to navigate and interact with their environment, and may be programmed to perform specific tasks or functions.