• an number, for example:
  
  • 3
  • -5.5
  • 1E-3
• an expression that will result into a number, for example:
  
  • 3+1
  • -5.5 + b, with b = 5
• an parameter that has a number as value, for example:
• b, with b = 5

See also Quaestor Syntax