# Operand

Depending on the position of the operand relative to the sign of the operation, one distinguishes between prefix (e.g. $\sin x$), infix (e.g. $a+b$) and postfix (e.g. $x^2$) operations. Dependent on the number of operands there are one-placed (unary or monadic), two-placed (binary or dyadic) and many-placed (or polyadic) operations.