Art of Assembly Language, 1st Edition

7.3. 7.3 Statement Labels

HLA low level control structures make extensive use of labels within your code. A low level control structure usually transfers control from one point in your program to another point in your program. You typically specify the destination of such a transfer using a statement label. A statement label consists of a valid (unique) HLA identifier and a colon, e.g.,

aLabel:

Of course, like procedure, variable, and constant identifiers, you should attempt to choose descriptive and meaningful names for your labels. The example identifier above, aLabel, is hardly descriptive or meaningful.

Statement labels have one important attribute that differentiates them from most other identifiers in HLA: you don't have to declare a label ...