The empty string is usually represented similarly to other strings.

We use the convention that the empty string has length 0.

If the string does not have a on the right hand side, the result is the empty string.

There's only eight and what looks like a lot of empty string.

The numbering starts at 1 or A, so the empty string is not used.

The equals sign may be omitted if the value is an empty string.

For text fields this is not blank nor the empty string.

In simple words, given some characters of an alphabet, the empty string is the word that can be made if no letters are used.

The empty string is also sometimes noted by the Greek letter λ.

(or if the empty string is not part of the alphabet).