The ion beam has a slightly diverging angle (about 0.1 radian). The radian per second is also the unit of angular frequency. The steradian (symbol&colon; sr) or square radian is the SI unit of solid angle. This procedure produces the formula expressed using radian measure of angles. Although the radian is a unit of measure, it is a dimensionless quantity. The radian is widely used in physics when angular measurements are required. It is usually specified as a frequency in Hertz or radian/sec. Five other miscellaneous derived units completed the draft proposal&colon; radian, steradian, hertz, joule and newton. This explains the physical significance of the name "joule per radian". A minute of arc is of a radian. As stated, one radian is equal to 180/ degrees. It is equivalent to of a turn, of a degree, or of a radian. The "binary degree", also known as the "binary radian" (or "brad"), is turn. The name is derived from the Greek 'solid' + radian. Yotvata started in 1951 as a Nahal settlement named Ein Radian.