The normal QRS axis, like the P wave axis, points downward and to the left within a coordinate between -30 o and +90 o. This axis is said to be deviated to the left (left axis deviation or LAD) if it lies between -30 o and -90 o; and deviated to the right (right axis deviation or RAD) if it lies between +90 o and 180 o.
Schema.org Structured Data. Schema.org (often called Schema) is a specific vocabulary of tags (or microdata) that you can add to your HTML to improve the way your page is represented in SERPs.chema.org (often called Schema) is a specific vocabulary of tags (or microdata) that you can add to your HTML to improve the way your page is represented in SERPs.
Relational schema: Relational schema may also refer to as database schema. A database schema is the collection of relation schemas for a whole database. Relational or Database schema is a collection of meta-data. Database schema describes the structure and constraints of data representing in a particular domain. set of attributes is called a relation schema (or relation scheme). A relation schema is also known as table schema (or table scheme).