A Matching Engines is a routing a order to the right market for execution.

A Matching Engines is a software system at a (stock) exchange. 

A Matching Engines is matching incoming buy and sell orders to find the best price.

A Matching Engines is a software system of the brokers and dealers to match the right time for execution.

A Matching Engines receives incoming orders via Order Routing Systems.

A Matching Engines receives executes Buy and Sell Orders and leads into a transaction.

A Matching Engines is a software system for finding the right security symbols (ISIN).