Do not use these names or symbols for your own data or labels.
| $ | DF | GROUP | ORG |
| * | DGROUP | GT | %OUT |
| + | DOSSEG | HIGH | PAGE |
| _ | DQ | IF | PARA |
| . | DS | IF1 | PROC |
| / | DT | IF2 | PTR |
| = | DUP | IFB | PUBLIC |
| ? | DW | IFDEF | PURGE |
| [ ] | DWORD | IFGIF | QWORD |
| .186 | ELSE | IFDE | .RADIX |
| .286 | END | IFIDN | RECORD |
| .286P | ENDIF | IFNB | REPT |
| .287 | ENDM | IFNDEF | .SALL |
| .386 | ENDP | INCLUDE | SEG |
| .386P | ENDS | INCLUDELIB | SEGMENT |
| .387 | EQ | IRP | .SEQ |
| .8086 | EQU | IRPC | .SFCOND |
| .8087 | .ERR | LABEL | SHL |
| ALIGN | .ERR1 | .LALL | SHORT |
| .ALPHA | .ERR2 | LARGE | SHR |
| AND | .ERRB | LE | SIZE |
| ASSUME | .ERRDEF | LENGTH | SMALL |
| AT | .ERRDIF | .LFCOND | STACK |
| BYTE | .ERRE | .LIST | @STACK |
| .CODE | .ERRIDN | LOCAL | .STACK |
| @CODE | .ERRNB | LOW | STRUC |
| @CODESIZE | .ERRNDEF | LT | SUBTTL |
| COMM | .ERRNZ | MACRO | TBYTE |
| COMMENT | EVEN | MASK | .TFCOND |
| .CONST | EXITM | MEDIUM | THIS |
| .CREF | EXTRN | MOD | TITLE |
| @CURSEG | FAR | .MODEL | TYPE |
| @DATA | @FARDATA | NAME | .TYPE |
| .DATA | .FARDATA | NE | WIDTH |
| @DATA? | @FARDATA? | NEAR | WORD |
| .DATA? | .FARDATA? | NOT | @WORDSIZE |
| @DATASIZE | @FILENAME | NOTHING | .XALL |
| DB | FWORD | OFFSET | .XCREP |
| DD | GE | OR | .XLIST |
| XOR |