In codes, code symbols may represent ________.

• A. Complete words
• B. Complete phrases
• C. Individual letters
• D. All of the above

Answer: (D)

Code symbols serve as stand-ins for parts of the plaintext, and the size of what they stand for can vary with the coding system. Some codes map a symbol to a single letter, letting you spell out the message letter by letter. Others use symbols to represent whole words, which is common in codebooks where a single symbol stands for a specific word or term. There are even schemes where a symbol represents a phrase or longer sequence of words, enabling more compact or specialized encoding. Because code symbols can be used to represent letters, words, or phrases, the most accurate conclusion is that they may represent all of these. So the correct understanding is that code symbols may represent individual letters, complete words, or complete phrases.