BIhE (http://www.lojban.org/en/publications/reference_grammar/chapter18.html)

Prefix attached to a mathematical operator to mark it as higher priority than
other mathematical operators, binding its operands more closely.

li ci bi'e pi'u vo su'i mu du li paze The-number 3 [priority] times 4 plus 5
equals the-number 17. 3 * 4 + 5 = 17

