noun:

• thick red ink (used for signature seals); red ink pad; vermillion ink; cinnabar ink

noun:

• tablet controller; tablet game pad; tablet gaming controller - abbreviation ➜ タブレットコントローラー

noun:

• pad placed below the sheet on which a seal is to be pressed - used to make the seal's imprint clearer

noun:

• desk pad; sheet of plastic (or cardboard, felt, etc.) placed under writing paper; underlay
• being pinned under; being caught under; being trapped under; being buried under; being crushed beneath
• model; pattern - often as 〜を下敷きにして

expression / noun:

• ball of a finger; finger cushion; pulp of the finger; pad of the finger