Definition
2468 is the section of the card built entirely from the even numbers two, four, six and eight, often with dragons or flowers alongside.
A deal heavy in evens with no odd numbers is pointing here. Because only four numbers qualify, pairs and pungs of them come up more often than a first count suggests.
Read the full guide: How to Read the Mahjong Card: The Notation, Decoded.
See it on real tiles: the coach reads any hand and names its direction, free, at the free read. Members get the coach on call for their own games.
More terms: Pung, Kong, Quint, Pair, Charleston, Blind pass, Courtesy pass, Joker.