Chapter Approved
Chapter Approved is a "stamp of approval" that Games Workshop puts on rules published in White Dwarf that are meant to be official. Back in Third Edition, every issue of WD had a column where Andy Chambers (and other Warhammer 40,000 writers) would write rules clarifications, errata, new army lists, and experimental rules (some of which were used in later editions); these columns were then combined into annual Codex-type volumes in 2002, 2003, and 2004. Unfortunately, with Chambers' departure from GW (and Games Workshop's general descent into corporate evil), the column fell by the wayside, and the "Chapter Approved" stamp is only seldom seen nowadays.