Sequence symbols consist of a period (.) followed by an alphabetic character, and up to 61 additional alphanumeric characters. Sequence symbols can be used in macro processing and conditional assembly instructions. They indicate the position of statements within the source program or macro definition. They are used in AIF and AGO statements to vary the sequence in which statements are processed by the assembler program. (See the complete discussion in How to write conditional assembly instructions.)

.BLABEL04            .#359
.BRANCHTOMEFIRST     .A