Strobogrammatic number Strobogrammatic number A strobogrammatic number is a number whose numeral is rotationally symmetric, so that it appears the same when rotated 180 degrees. In other words, the numeral looks the same right-side up and upside down (e.g., 69, 96, 1001). A strobogrammatic prime is a strobogrammatic number that is also a prime number, i.e., a number that is only divisible by one and itself (e.g., 11). It is a type of ambigram, words and numbers that retain their meaning when viewed from a different perspective, such as palindromes. When written using standard characters (ASCII), the numbers, 0, 1, 8 are
Degree symbol degree such as minute (′), second (″), and third (‴), which originate as small raised Roman numerals. In the case of degrees of angular arc, the degree symbol follows the number without any intervening space (e.g., 30°). The addition of minute and second of arc units follow the degree units, with intervening spaces between the units but no spaces between the numbers and arc symbols (e.g., 30° 12′ 5″). In the case of degrees of temperature, three scientific and engineering standards bodies (BIPM, ISO and the U.S. Government Printing Office) prescribe printing temperatures with a space between the number and