If you mean 2.5mm2 25-core flex cable, it is a flexible electrical cable made up of 25 individual copper cores, with each core having a 2.5mm2 conductor size.
Description
* Size: 2.5mm2 per core
* Number of cores: 25 cores
* Conductor: Usually stranded copper for flexibility
* Insulation: PVC or another flexible insulating material
* Type: Multi-core flexible cable
* Uses: Control panels, machinery, industrial equipment, automation systems, and applications requiring many separate electrical/control connections.
* Main advantage: Provides 25 separate circuits/connections in one cable, while remaining flexible and easy to install.