Some call it a chip/check; some a jeton; some a token... and there are even some who call it a plaque because it's oval shape.

The term "jeton" is found in the "older" casino supply catalogs from France (who also sold to German and Belgian casinos) describing any small chip-like device (PLAQUES are the larger type; rectangle, oval, square and...). Recently, European manufacturers have been distinguishing between the "American Style" (chips) and French Style (jetons) similar to your plastic material. I think we're safe in doing what our chip guide authors have done in the past... to stick with terms that the manufacturer calls their product.

JB