To facilitate visual imagery, each token of the type <math>{}^{\backprime\backprime} \text{X} {}^{\prime\prime\text{Y}}\!</math> can be pictured as a specific occasion where the sign <math>{}^{\backprime\backprime} \text{X} {}^{\prime\prime}\!</math> is being used or issued by the interpreter <math>\text{Y}.\!</math> | To facilitate visual imagery, each token of the type <math>{}^{\backprime\backprime} \text{X} {}^{\prime\prime\text{Y}}\!</math> can be pictured as a specific occasion where the sign <math>{}^{\backprime\backprime} \text{X} {}^{\prime\prime}\!</math> is being used or issued by the interpreter <math>\text{Y}.\!</math> |