sender
Communication source
Director telephone system
Panel switch
Register signaling
https://source.unsplash.com/featured/?sender#.png
/suto3/google.iconsender
/suto3/Google画像検索.iconsender
/suto3/Google定義検索.icon sender
/suto3/wikipedia.iconsender
/suto3/weblio.icon sender
/suto3/kotobank.icon sender
/suto3/jisho.icon sender