ColumnForm[, , ... ] prints as a column with above , etc.
ColumnForm[list, horiz] specifies the horizontal alignment of each element.
ColumnForm[list, horiz, vert] also specifies the vertical alignment of the whole column.
Possible horizontal alignments are:
Possible vertical alignments are:
The first argument of ColumnForm can have any head, not necessarily List.
ColumnForm acts as a "wrapper", which affects printing, but not evaluation.
See The Mathematica Book: Section 2.7.6 and Section 2.8.7.
See also: TableForm, MatrixForm, SequenceForm, GridBox.