You can output certain characters as icons using the addition ...AS ICON. You should only address these characters with their system-defined names. The include <ICON> (or the more comprehensive include <LIST>) contains the relevant identifiers as constants, e.g. ICON_OKAY (see List of icons).
INCLUDE <ICON>. WRITE: / ICON_OKAY AS ICON, "output as icon 'Text line'.
Although an output length of 2 characters is enough for most
icons, some (e.g. the traffic light icons ICON_RED_LIGHT ,
...) have a greater output length.
You can determine the length of an icon with DESCRIBE FIELD ICON_... output length ... .
You cannot print out all list icons. The printable icons are flagged as such in the 'list of icons' mentioned above.