The plus sign (+) is a mathematical symbol used to indicate addition. It represents the operation of combining two or more numbers or quantities. For example, in the equation 2 + 3 = 5, the plus sign shows that 2 and 3 are being added together to equal 5. In addition to its mathematical use, the plus sign is also commonly found in various contexts, such as in programming languages and in everyday language to signify a positive aspect or an increase. For instance, in social media, a plus sign may indicate a positive reaction or endorsement, similar to the concept of likes.