|Japanese (base text)||
A column (
The TCG term "column" was first mentioned in card text in Cyberdark Impact, and there was no OCG equivalent for quite some time until the OCG equivalent of the TCG Problem-Solving Card Text was implemented, prior to which, instead of being in the "same column", your opponent's cards were said to be "opposite" (正面 shōmen) to yours.
Master Rule 3
Every column contains exactly 4 Zones: a Monster Zone and a Spell & Trap Zone on each player's side of the field.
New Master Rule
As per New Master Rule, the second column and the fourth column (counting from either direction) have 5 Zones, while all others contain 4 Zones. The second and fourth columns each contain an Extra Monster Zone, in addition to the Main Monster Zone and Spell & Trap Zone on each player's side of the field.
The following are the cards that mention columns in their card text: