Numerals are a type of format native to the Net who are shaped like numbers. They come in a variety of colours, have two arms and two legs, and may have one central eye or two laterally-facing eyes. They are a higher energy format than Binomes, but lower than Sprites. (The Medusa Bug).
In Mainframe, numerals are less common than sprites, and nowhere near as common as binomes. They are most often seen in Level 31. Numerals have not been seen in any other systems on the Net.
And, who is shaped like a large ampersand and is technically not a number, may be considered in the same format. (My Two Bobs)