Short notes are a type of written communication used to convey information quickly and concisely. The term can refer to four different types of documents: MEMOS (5 letters), CHITS (5 letters), IOUS (4 letters), and LINES (5 letters). MEMOS are typically used in business settings to communicate information within an organization. CHITS are short notes that serve as a reminder or record of a transaction. IOUS are written acknowledgements of debt. LINES are short, poetic verses.