The abacus was a great invention in ancient China and has been called by some Western writers the earliest calculating machine in the world. The abacus has a long history behind it. It was already mentioned in a book of the Eastern Han Dynasty, namely Supplementary Notes on the Art of Figures written by Xu Yue about the year 190 A. D.
Subordination and Non Disturbance Agreements, commonly referred to as âSNDAs,â are typically an agreement between a tenant, a landlord and the landlordâs lender.
Service set (802.11 network) In computer networking, a service set (SS) is a set consisting of all the devices associated with a consumer or enterprise IEEE 802.11 wireless local area network (WLAN). The service set can be local, independent, extended or mesh.