Tetrad
The word meaning four of something is "quattro," derived from the Italian language. In English, the term "quad" is often used to denote four, as seen in words like "quadrant" or "quadruped." Another term is "tetrad," which specifically refers to a group or set of four items.
A dyad refers to a group or pair of two individuals or elements, while a tetrad refers to a group or set of four. Dyads are often linked in a close relationship or partnership, while tetrads can refer to various structures or patterns that involve four parts or components.
The term Tetrad means a group of four. It can be used in any context when talking about something that has a collective of four such as a tetrad of cats.
A four-member group is typically referred to as a "quartet." This term is commonly used in music to describe a group of four performers, such as a vocal or instrumental ensemble. In other contexts, such as social or organizational settings, it may simply be called a "group of four" or a "team of four."
The prefix "tetra-" in the term tetralogy means "four." In medical terminology, tetralogy refers to a group of four associated symptoms or conditions.
A social group of four people is often referred to as a "quartet." This term is commonly used in various contexts, including music, where it denotes a group of four musicians or singers. In a broader social context, it can simply describe any group of four individuals interacting together.
A better word to use might have been "group" or "lot." To call it a "set" would imply that there were different varieties of coin that year, but there weren't. It's just four pennies from the same year is all.
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A quartet or quartette is usually used for a set of four people playing music but not only for that.
One word is quartet.Some others are tetrad and foursome.If they are four people, a jocular term is "gang of four".
The term "set of men with four arms" typically refers to a hypothetical or fictional group, as humans naturally possess two arms. In mythology or science fiction, characters with four arms may be depicted, often representing extraordinary abilities or traits. In a mathematical or philosophical context, it could also denote a specific category or classification. However, in reality, no known human being has four arms.