This is a callout marker. Like all ChartIQ markers, the object itself is managed by the chart, so when you scroll the chart the object moves with you. It is also destroyed automatically for you when the symbol is changed. This is an example of a complex marker which can contain html, video, images, css, and animations.
Indices are designed to be broad measures of performance of an asset class or a subset of that asset class. So that indices are widely adopted, the methodology used to create an index is often published to give stakeholders an understanding of how decisions governing index calculation are made.
Index card. An index card (or system card in Australian English) consists of card stock (heavy paper) cut to a standard size, used for recording and storing small amounts of discrete data. A collection of such cards either serves as, or aids the creation of, an index for expedited lookup of information (such as a library catalog or a back-of-the-book index).