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Built-in Mathematica Symbol

Span (;;)

i;;j
represents a span of elements i through j.

i;;
a span from i to the end.

;;j
a span from the beginning to j.

;;
a span that includes all elements.

i;;j;;k
a span from i through j in steps of k.

i;;;;k
from i to the end in steps of k.

;;j;;k
from the beginning to j in steps of k.

;;;;k
from the beginning to the end in steps of k.

m[[i;;j]]=v can be used to reset a span of elements in a list or other expression.

Take a span of elements from a list:

Assign to a span of elements:

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