What aspect of Unicode is essential for making text accessible?

The essential aspect of Unicode that enhances text accessibility is the assignment of a unique number to each character. Unicode is a standardized character encoding system that allows for consistent representation and manipulation of text across different platforms and languages. By assigning a unique number, or code point, to each character, it ensures that text is uniformly recognized and displayed, regardless of the software or digital environment being used.

This uniformity is crucial for assistive technologies, such as screen readers, which rely on correctly interpreting characters to convey written information to users with disabilities. When each character has a distinct Unicode representation, it minimizes confusion and errors in text rendering, ultimately allowing for a more accessible experience for all users.

Other options, while they may enhance the visual appeal or support multilingual text, do not directly impact the fundamental accessibility provided by a standardized character encoding system like Unicode.