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
Flag of the Soviet Union Kremlin which bore the single-side official design. For vertical display, the flag was made with the distinct difference of having the hammer and sickle rotated 90 degrees in order to compensate for the change in dimensions. This was common in official practice, however the common flag owner would simply hang the standard design of the flag by the hoist. During the establishment of the Russian SFSR, Vladimir Lenin and his comrades had considered the inclusion of a sword symbol in addition to the hammer and sickle as part of the state seal on which the flag was eventually based. The