sketchbook; scribble pad
A notebook or pad used for casual drawing, doodling, or scribbling.
When I was a child, I often drew comics in my sketchbook.
During the meeting, I was doodling on a scribble pad.
Standard kanji spelling.
Variant spelling; 落書き is more common than 落書.
Compound of 落書き (doodle, scribble) and 帳 (notebook, register).