This field has similar functionality like ICON but instead of better looking icons, you can choose to display old-style ASCII symbols from type-pool SYM. Like in an example of ICON you have to setup the fieldcatalog value for field SYMBOL to ‘X’ and in the corresponding field of your internal table, you have put the value of the symbol. The corresponding field should be CHAR1 field.
Figure 39 ZDEMO_AIN_CL17 ALV with symbols
You can check the available symbols on your system, but I doubt they vary between old and new releases.
Figure 40 Possible symbols in ALV Grid