icon?
do you mean a .desktop file ?
these are just simple files which contain metadata
cat ~/Desktop/terminator.desktop
Code:
[Desktop Entry]
Type=Link
Name=Terminator
Icon=terminator
URL=/usr/share/applications/terminator.desktop
cat /usr/share/applications/terminator.desktop
Code:
[Desktop Entry]
Name=Terminator
Name[af]=Terminator
Name[ar]=المتطرف
<snip>
Comment=Multiple terminals in one window
Comment[af]=Veelvuldige terminale in een venster
Comment[ar]=العديد من الطرفيات في نافذة واحدة
<snip>
TryExec=terminator
Exec=terminator
Icon=terminator
Type=Application
Categories=GNOME;GTK;Utility;TerminalEmulator;System;
StartupNotify=true
X-Ubuntu-Gettext-Domain=terminator
X-Ayatana-Desktop-Shortcuts=NewWindow;
Keywords=terminal;shell;prompt;command;commandline;
[NewWindow Shortcut Group]
Name=Open a New Window
Exec=terminator
TargetEnvironment=Unity
you are going to have to give more detail on what you actually want to copy to your thumbdrive