General form:

{ <expr> }

Examples:

These are allowed in .model lines and in device lines. A SPICE number is a floating point number with an optional scaling suffix, immediately glued to the numeric tokens (see Chapt. 2.8.5). Brace expressions ({..}) cannot be used to parametrize node names or parts of names. All identifiers used within an <expr> must have known values at the time when the line is evaluated, else an error is flagged.