Meaning of Intel (E4) Symbol on CPUs

[gplnpsb]

Does anyone know what the circumscribed e4 symbol after the batch number on the heatsink of Intel CPUs means? It doesn't seem to be something common like the Registered Trademark Symbol (R).

 

[T_Yamamoto]

http://newsroom.intel.com/community...computer-engineering-goes-intel-cluster-ready

E4 Computer Engineering, an Italian IT company with HPC recognition, and reference customers such as e.g. C.E.R.N. and EPFL, has recently completed a further step to maintain excellence in the research and development of highly-advanced HPC solutions by obtaining the Intel® Cluster Ready certification for the system E-Cluster 7225. The Intel Cluster Ready certification helps to ensure E-Clusters, from 4 to hundreds of nodes, based on Intel® Xeon® 5600 series processors, InfiniBand and Ethernet, are ready to install and run all major parallel ISV applications out-of-the-box. Learn more about E4's Intel Cluster Ready solutions

http://www.e4company.com/IntelClusterReady_it-it.aspx?sid=09a0bdd909c74cf98cf1f8cb5e9c0d4a