1) Uncommon Latin letter 
Cuatrillo (capital: Ꜭ, small: ꜭ) (Spanish for `little four`) is a letter of several colonial Mayan alphabets in the Latin script that is based on the digit 4. It was invented by a Franciscan friar, Alonso de la Parra, in the 16th century to represent the velar ejective consonant kʼ found in Mayan languages, and is known as one of the Parra .....