Typically refers to the first 32 characters in the ASCII character set, which are single-byte codes used to control printers and serial communications. See ASCII.
Browse entries near unprintable characters
unpretentiousness
unpriced
unprincipled
unprincipled (synonyms)
unprintable
unprocessed
unproductive
unproductive (synonyms)
unprofessional
unprofessional (synonyms)