Possible Clues:

• Semicolon alternative
• Break indicator
• Part of a suspended sentence?
• Linear punctuation mark
• Punctuation mark akin to a semicolon
• Punctuation that may indicate parenthetical remarks
• Punctuation mark longer than a hyphen
• Punctuation mark sometimes used in place of a comma or colon
• Punctuation mark often used in pairs
• Punctuation mark that breaks up a sentence