Rockwell Automation FactoryTalk Historian SE ProcessBook 3.2 User Guide - Manual (Page 261)

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 UOM - allows you to select a unit of measure for a given
attribute.
6. [Optional] Click Add Element Name to add the element name of the
current context to the symbol. Select the Use Full Path check box to
show the full path of the current context instead of just the element
name.
7. Click OK to add the selected attribute(s) to your dynamic symbol.
Context Path
A context path relates an AF Attribute to a parent element within an AF
database. An AF Attribute added as a data stream to a dynamic symbol can
point to different underlying FactoryTalk Historian points, depending on
its context path.
Context paths can be used to drive displays created in FactoryTalk
Historian ProcessBook and other FactoryTalk Historian client applications.
Displays that utilize context paths in this manner are referred to as
element-relative because the data displayed for the attribute at any time
depends on the context path that links the attribute to a parent element.
Context paths are used most frequently to change the data displayed by a
symbol based on user selection. For example, based on the selection of AF
Elements or attributes that represent assets in a plant, a display may present
data from parallel assets in a single plant or in different locations.
For example, assume Tanks 1-5 in a plant are all described by the same
measurement attributes of temperature and pressure. Each tank is
represented as an element in the AF database with corresponding
temperature and pressure attributes. A display that references the
temperature attribute could display data for each tank in turn by allowing
the user to specify the context path to any particular tank element.