operator

A sign or symbol that specifies the type of calculation — such as addition, subtraction, or multiplication — to perform on the elements of a formula. Operators include:

• Mathematical operators, which perform basic mathematical operations.
• Comparison, or logical, operators, which compare two values and produce the value TRUE or FALSE.
• The text operator & (ampersand), which connects, or concatenates, two pieces of text into a single combined text value.
• Reference operators, which produce one reference to a cell or range of cells from two references.