Final answer:
In computer programming or graphics, the number 0 is typically used to choose the first frame index of an object due to zero-based indexing.
Step-by-step explanation:
The question 'What number is used to choose the first frame index of an object?' seems to be related to computer programming or computer graphics, where objects are represented in sequences or arrays, and indices are used to refer to specific frames or elements. In most programming languages, the number used to choose the first frame index of an object is typically 0. This is because these languages often use zero-based indexing, where the first element in an array or list is indexed at 0. This concept is an essential part of understanding how to work with data structures in both simple and complex computer applications, including animations and simulations that involve frames of reference.