What is the standard term for a 1.5 ounce measure in bartending?

The standard term for a 1.5 ounce measure in bartending is typically referred to as a “jigger.” A jigger is a bartending tool designed to help bartenders accurately measure out spirits and other liquids. The jigger itself usually comes in a double-sided design, often with one side measuring 1 ounce and the other side measuring 1.5 ounces or 2 ounces, allowing for precise pouring to ensure consistency in drinks.

While "shot" is a commonly used term in social contexts to refer to a single serving of distilled liquor, it may not always equate to a standard measurement and can sometimes vary in volume depending on local practices. The terms "pour" and "measure" are more generic and do not specifically denote a fixed volume like a jigger does. Thus, jigger stands out as the correct answer due to its specific reference to the measurement that bartenders rely upon for accuracy and consistency in their drink-making practices.