• 簡単かんたん — simple; easy
• 簡素かんそ — simplicity; plainness
• 簡略かんりゃく — abridgment; simplification
• 簡易かんい — simple; convenient
• 簡潔かんけつ — concise; succinct
• 簡便かんべん — handy; easy-to-use
• 簡略化かんりゃくか — streamlining; simplification

The top ⺮ (bamboo) points to ancient bamboo slips used as writing material. The right side supplies the sound and supports meanings tied to written notes and, by extension, “simplicity” and “brevity.”