Which modification signals the absence of ice in a beverage?

The modification that signals the absence of ice in a beverage is represented by the initials "NI," which stands for "No Ice." This designation serves as a clear indication to baristas and staff that the customer prefers their drink served without ice, ensuring that the beverage is prepared according to the individual's specifications.

This is particularly important because serving a beverage without ice can affect the drink's temperature, dilution, and overall flavor profile. For example, customers may request drinks to be served "NI" in situations where they want to control the strength of the flavors or simply prefer the texture of the beverage without ice.

The other choices represent different modifications that do not specifically indicate the absence of ice.