# Inscription and symbols
Vester's Inscription and Symbols
`By clicking the button SYMBOLS, a special menu shows different symbols to mark (e.g. external disturbing factors, positive and negative feedback cycles, time delays) and also offers an editor for inscriptions.
All symbols from the window are put in the working field by a mouse click on the symbol and a second click in the field. The symbols or texts from the editor can be moved around in the working field while holding the left mouse key pressed.
To delete a symbol or text, click it with the right mouse key. The appearing context window leaves the choice of changing a text, attributing a symbol to a certain variable or text or to delete it.
* [ ] External disruptive factor
* [x] Time delay
* [x] Reinforcing feedback
* [x] Stabilizing feedback
* [ ] Good prospects
* [ ] Bad prospects
* [ ] High costs or profits
* [ ] Matter of legislation
* [ ] Relevant for the environment
* [ ] Emotional matters
* [ ] Unsolved problem
* [ ] Sledgehammer method
* [ ] Still unclear
* [x] Very important