It means Parts Per Million. It is generally used to measure and denote the concentration of chemical in very low quantity. e.g we say the sea water contains 0.5 ppm of pure gold. Or human blood contains 20 ppm of iron oxide. This unit is used when other units like % and fractions are too big to denote the quantity.
ASP.NET Dynamic Data. ASP.NET Dynamic Data is a Ruby on Rails-inspired web application scaffolding framework from Microsoft, shipped as an extension to ASP.NET, that can be used to build data-driven web applications.
Data structure diagram (DSD) is a diagram of the conceptual data model which documents the entities and their relationships, as well as the constraints that connect to them. The basic graphic notation elements of DSDs are boxes which represent entities.The arrow symbol represents relationships.