Play word 神代文字 神代文字 じんだいもじ ancient Japanese characters (regarded today as created at a much more recent date)
Play word 川の字 川の字 かわのじ (formation of) three people sleeping side by side (esp. a child between two parents)
Play word 組み文字 組み文字 くみもじ block of multiple characters arranged in a space equivalent to that of a single character