Perhaps the user is referring to a fictional product from a Czech movie or TV show? If I can't find it, maybe it's a made-up term or a mix-up. For example, combining "Linda" with a random number.
: In Central Europe, 4-digit codes starting with 756 often refer to the Zlín region of the Czech Republic. For instance, 756 61 is the postal code for Rožnov pod Radhoštěm , a significant town known for industrial precision and the company myonic s.r.o. , which operates an assembly plant there. czech linda 7561