Ahmet Zappa in live performances. Under Ahmet's direction, the trust proposed a trademark on the name "Zappa", which would prevent Dweezil from using the name for commercial purposes without authorization. Since 2006, Dweezil toured with an act called Zappa Plays Zappa, playing his father's music. The trust sought to collect a fee from Dweezil for continued use of the name, as well as proceeds from merchandise sold at Zappa Plays Zappa concerts. In response to the trust's action, Dweezil renamed his performance series "50 Years of Frank: Dweezil Zappa Plays Whatever the F@%k He Wants — the Cease and Desist Tour. Zappa
Digit (unit) one twelfth of the diameter of the sun or the moon. This is found in the Moralia of Plutarch, XII:23, but the definition as exactly one twelfth of the diameter may be due to Ptolemy. Sosigenes of Alexandria had observed in the 1st century AD that on a dioptra, a disc with a diameter of 11 or 12 digits (of length) was needed to cover the moon. The unit was used in Arab or Islamic astronomical works such as those of Ṣadr al‐Sharīʿa al‐Thānī (d.1346/7), where it is called "iṣba' ", digit or finger. The astronomical digit was in use