noun

• (slang) A banknote with a value of five units of currency.
• (slang, by extension) The value in money that this represents.
• (colloquial) A clenched fist.
• A mathematical puzzle played on a 5 × 5 grid.
• (Islam) A Zaydi Shiite Muslim, who disagrees with the majority of Shiites on the identity of the Fifth Imam.
• (religion) A person who gives five percent of their income or five hours a week of their time to charity (a reduction of ten percent tithing).
• (Islam) A Zaidi Shi'a Muslim.
• (fandom slang) A fan of the American science-fiction television series Babylon 5.