Answer:

No. Any type of symbolic data can be represented using binary, not just numbers. At the electronic level, everything is a bit pattern (which some people call a "number"), so the statement is sort-of correct.

End of this chapter.

You may wish to review the following terms. Click on the hypertext phrase to go the page where the term was discussed.

binary What "binary" means.
bit What a "bit" is.
binary, advantages The advantages of using binary in a computer.
analog What "analog" means.
threshold How thresholds are used.
clocks The master clock of a computer.
memory, as bit patterns Memory contents as bit patterns.