Lets collect random symbols like that

(These are only in Android, keepassdx and jerboah)

• floppy: save
• pen: edit
• chain: link
• globe: internet
• sizzor: cut
• notepad: paste/clipboard
• studio mic: audio
• trashcan: delete
• airplane: antennas off
• radio cell: hotspot, wifi
• metal bell: message
• server rack: storage
• speaker: sound
• sun: brightness
• key: encryption, vpn
• lock: encrypted / needs permission escalation
• unlock: decrypted, readable by current user
• folder: directory
• folder with zipper: archive
• house: home dir, launcher, main view
• clothes pin: attached file
• letter: email
• gear: configuration
• magnifying glass: search
• laboratory glass: experiment
• picture with mountain or sunflower: gallery

Some more