What is the next term?
$$\text{B}:16::\text{E}:?$$

Let's find the logic connecting the letter to the number in the first pair:
* The alphabetical position of the letter $\text{B}$ is $2$.
* The given code value is $16$, which can be written as $2^4=16$.

Applying the same logic to the second pair:

* The alphabetical position of the letter $\text{E}$ is $5$.
* The corresponding value will be $5^4$:

$$5^4=5\times 5\times 5\times 5=625$$

Thus, the missing term is $625$.