Silicobra is a Pokémon which resembles a small snake. Its body is mostly brownish white with a few darker spots. It has oval green eyes with black pupils, each one surrounded by a brown spot similar to a sand stain and a brown protuberant ridge above it. Paired with its crooked downward mouth, its face is similar to a frown. It also has two big nostrils. It has a dark yellow pouch around its neck, which it uses to store sand, being able to store more than 17 pounds in it. Silicobra collects sand by swallowing it and is able to shoot it from its nostrils, an ability it uses to blind predators so it can escape by burrowing into the ground.
Silicobra's Japanese name and category are identical, with the only difference being in how they are written: Silicobra's Japanese name is written in katakana (スナヘビ), while its category name is written in hiragana (すなへび). Silicobra is the only Pokémon with this distinction.
Silicobra resembles various snakes, and the sand pouch around its neck is similar to the hood of a cobra. It may be specifically based on the false cobra, a species that lives in deserts of North Africa and the Middle East, named so because much like a cobra, it can flare its neck into a hood when threatened.
Silicobra may be a combination of silicon (basic constituent of sand) and cobra. It may also incorporate silt.
Sunahebi may be a combination of 砂 suna (sand) and 蛇 hebi (snake).