d'Alembert
noun
d'A·lem·bert ˈda-ləm-ˌber 
ˌdä-läⁿ-ˈber
: a system of betting in which the player increases the stake by one unit each time a bet is lost and decreases the stake by one unit each time a bet is won
called also progressive system
Word History
Etymology
after Jean LeRond d'Alembert †1783 French mathematician