"Iron-on" is a term commonly used to refer to the process of applying a design or lettering onto a fabric using heat. Synonyms for this term can vary depending on the context and specificity of the product being used. "Heat transfer" is a popular alternative term that refers to the same process. "Heat press" is a synonym that describes the tool used to apply the design, while "transfer paper" is often used to describe the material onto which the design is printed. Other terms such as "iron-on transfer," "iron-on vinyl," and "iron-on applique" may also be used depending on the specific product being applied.