18:26 · Known as the whip, this type of sign means, when appearing in the margin of a letter, supplement or supplements are enclosed. With the left point exchanged for a number the number of supplements enclosed is given.
    The variation is a trade and commerce sign meaning minus or with a reduction of...
    The sign is sometimes used as a synonym.
    Compare these signs with the repeat sings in musical notation, , and , and with the sign used in geometry to denote proportion.