Cipher (noun)

1. A system of symbols, letters or words used to conceal a message through encryption.
2. A symbol used to represent a number or a quantity.
3. A person or thing of little importance or value.

Origin:

The word "cipher" comes from the arabic word "sifr" which means zero or empty. it was first recorded in english in the early 16th century.

Examples:

1. The government used a complex cipher to encrypt classified documents.
2. The ancient Egyptians used hieroglyphs as a kind of cipher.
3. The young man felt like a cipher in the large corporation.
4. The codebreaker was able to decipher the enemy's cipher.
5. The company used a cipher to encrypt the sensitive data in their system.