U+1D134 Musical Symbol Common Time

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A time signature (also known as meter signature, metre signature, and measure signature) is a convention in Western music notation that specifies how many note values of a particular type are contained in each measure (bar). The time signature indicates the meter of a musical movement.

In a music score the time signature appears as two stacked numerals, such as ⁴
₄ (spoken as four–four time), or a time symbol, such as (spoken as common time). It immediately follows the key signature (or if there is no key signature, the clef symbol). A mid-score time signature, usually immediately following a barline, indicates a change of meter.

Most time signatures are either simple (the note values are grouped in pairs, like ²
₄, ³
₄, and ⁴
₄), or compound (grouped in threes, like ⁶
₈, ⁹
₈, and ¹²
₈). Less-common signatures indicate complex, mixed, additive, and irrational meters.