Sentence enders are punctuation marks that indicate the end of a sentence. The most common sentence ender is a PERIOD, which is represented by the 6-letter word 'PERIOD'. Other common sentence enders include the 3-letter words 'DOT' and 'ETC', which stand for 'DOT' and 'etcetera' respectively. Less common sentence enders include the 6-letter words 'PAROLE' and 'PARDON', which refer to the release of a prisoner from prison before the completion of their sentence.