The letter A, representing the first letter of the modern English alphabet, displayed in bold type with its phonetic pronunciation.

The image shows the letter A in bold, black font. Below the letter, there is text that reads:

> NUMBER ONE IN THE MODERN ENGLISH ALPHABET
> [ ei ]

Explanation of the Problem and Solution:

1. Understanding the Task:
- The task appears to be related to identifying the first letter of the modern English alphabet.
- The image explicitly states "NUMBER ONE IN THE MODERN ENGLISH ALPHABET," which directly points to the letter A.

2. Key Elements in the Image:
- The large, bold letter A is prominently displayed.
- The phrase "NUMBER ONE IN THE MODERN ENGLISH ALPHABET" confirms that the letter being highlighted is indeed the first letter of the alphabet.
- The phonetic transcription `[ ei ]` represents the pronunciation of the letter A (as in "ay").

3. Solution:
- The problem is straightforward: identify the first letter of the modern English alphabet.
- The solution is clearly the letter A, as indicated by the image and the accompanying text.

Final Answer:

$$
\boxed{A}
$$