Use
A field displayed on a page can be named with a field label.
You can choose an application-specific text that describes the field in greater detail as text for the label. If the field is an ABAP data object with a Dictionary reference, a suitable label can be determined from the corresponding elementary Dictionary type with method
Example
Table with Label and Quickinfo as Column Header

Dictionary definition of the data element for field SFLIGHT-CONNID:

See also:
Service method
GET_FIELD_LABEL.