&SYSASM System Variable Symbol

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Use &SYSASM to obtain the name of the assembler being used to assemble your source module. &SYSASM has a global scope. For example, when IBM High Level Assembler for z/OS & z/VM & z/VSE is used, &SYSASM has the value: 
HIGH LEVEL ASSEMBLER
Notes:
  1. The value of the type attribute of &SYSASM (T'&SYSASM) is always U.
  2. The value of the count attribute (K'&SYSASM) is the number of characters assigned. In the example, the count attribute of &SYSASM is 20.