👉 In mathematics, a "decasyllable" is a number that can be expressed as a product of two or more distinct prime numbers. This means that the number has no factors other than itself and 1. For example, 20 = 2 × 5 × 2. Decasyllables are important in coding theory because they allow for efficient storage and decoding of messages over binary channels. They are also used in cryptography to create secure communication systems.