ï· An introduction to AT&T and its global security organization, ï· A summary of customersâ security responsibilities, In general, the use of âsecurityâ throughout this document refers to âinformation and network. securityâ.
arch definition In architecture, a curved or pointed opening that spans a doorway, window, or other space. Note: The form of arch used in building often serves to distinguish styles of architecture from one another.
keystone-the central building block at the top of an arch or vault. headstone, key. arch - (architecture) a masonry construction (usually curved) for spanning an opening and supporting the weight above it. building block-a block of material used in construction work.