Jotter
/ˈdʒɑːtər/
Definition 1 of 1
Pro Tip 1/3Casual Use
Jotter is less formal than notebook, often used for personal, quick notes. 
Grab your jotter and we'll brainstorm some ideas.
Pro Tip 2/3Physical Size
A jotter is typically small and handy, suitable for carrying around. 
My jotter fits perfectly in my purse for on-the-go notes.
Pro Tip 3/3Creative Tool
Jotters are often used for drawing or quickly capturing creative ideas. 
She pulled out a jotter to doodle her latest design ideas.