The name Tetra is derived from the Latin language and is primarily a gender-neutral name. It carries the meaning of "Four" or "A Type of Fish." In the context of fish, Tetra is commonly associated with small freshwater characiform fishes, originating from Africa, Central America, and South America. These fishes belong to the Characidae family and are known for their distinctive features, including a small adipose fin and vibrant colors, making them popular choices for home aquariums. The name Tetra is also related to the genus name Tetragonopterus, which signifies "square-finned" in Greek. This name reflects the unique physical characteristics of these fish, such as their compressed bodies and identifiable fins. Despite its taxonomic origins, the term "tetra" has become widely used in the fishkeeping hobby, encompassing various unrelated fish species.