Block letters refer to a style of writing in which each letter is formed by a combination of straight lines and sharp angles to create the impression of a solid, uninterrupted block. Some synonyms for block letters include capital letters, uppercase letters, printed letters, sans-serif fonts, and bold fonts. These terms are commonly used interchangeably to describe the same style of writing. Block letters are commonly used for titles, headings, and signage as they are bold and easy to read, even from a distance. They have become a mainstay in modern typography and continue to be popular among graphic designers and typographers alike.