Question: In 19th century texts on astronomy, the planets are often represented by [symbols](http://en.wikipedia.org/wiki/Astronomical_symbols): ☿ for Mercury, ♀ for Venus, etc..

Did NASA ever use these symbols, or were they already obsolete by then? If they did use them, I'd expect it to be very early on.

Answer: 
Mariner Jupiter Saturn, later named Project Voyager, initially had the Jupiter and Saturn symbols on the project logo.![enter image description here](https://i.stack.imgur.com/adimi.jpg)
In the astronomical literature and therefore by NASA, at least the Earth and Sun symbol are used by standard to denote parameters like radius, mass, luminosity of the Earth and the Sun. It is customary to denote $\rm R\_{\oplus}$, and $\rm R\_{\odot}$, whereas for Jupiter (probably as it is not implemented in standard latex) one nowadays usually uses $\rm R\_{J}$ or $\rm R\_{Jup}$.