Bismillah..
These are symbols in SAP Script…
&SYMBOL& No formatting
&SYMBOL+4& Offset – Output begins here. Offset refers to formatted value
&SYMBOL(5)& Length – Output data in the specified length
&SYMBOL(I)& Suppress initial value – If the field has been initialized, nothing is output
&SYMBOL(Z)& Suppress leading zeros
&SYMBOL(C)& Compress blank spaces – Consecutice spaces are compressed into a single space. Leading spacesare suppressed.
&SYMBOL(R)& Right align output
&SYMBOL(S)& Operators are suppressed
&SYMBOL(*)& Dictionary length – The data length is defined by the ABAP dictionary
&SYMBOL(8.2)& Decimal format. Length 8 decimals 2
&’text1’SYMBOL’text2’& Text can be inserted before and after the symbol
Reference : https://community.sap.com/t5/application-development-discussions/this-syntax-marm-brgew-cz-at-sapscript-means-what/m-p/3105246