1s12

1s12 is a shorthand notation used in music, specifically in the context of musical tuning and temperament systems. It refers to an interval of one semitone. In music theory, intervals are often described by their size (number of scale steps) and their quality (major, minor, perfect, augmented, diminished). The number "1" in 1s12 indicates one semitone, which is the smallest interval in Western music. The "s" typically stands for semitone. The "12" is less commonly used as part of this specific notation but might appear in contexts discussing microtonal music or systems that divide the octave into more than 12 equal parts. However, when referring to standard Western tuning, 1s12 is synonymous with a minor second or an augmented unison, depending on the context. For example, the interval between C and C# is one semitone. If the root note is C, C# would be a minor second above C. In some theoretical discussions, the interval between C and C itself could be considered an augmented unison if it were raised by a semitone, though this is a less common usage. The primary function of 1s12 is to denote the basic building block of pitch movement in most musical systems.