neuter genders

[Jane]

I´ve observed that in addition to masculine and feminine gendres, there´s also the neuter genders which is formed by introducing lo before certain adjectives to designate generic or abstract concepts:
lo mejor,
lo bello,
can you guys please give more examples?

Also, explanations and examples of when change in gender signify change in meaning:
el frente - the (war) front.
la frente - the forehead.

[Alfonso]

You just have to put and adjective after lo to have an abstract name. Anyone is OK:

Lo rojo.
Lo americano.
Lo extraordinario.
Lo singular.
Lo iluminado.
Lo incierto.
Lo carismático.
Yes, there are some names in Spanish whose meanings change depending on the genre:

La orden: the order.
El orden: the tideness.

[María José]

Tidiness. No article.

[Jane]

Does la siguente and el siguente mean different things?

[María José]

No, they are just the masculine and feminine of the same thing.
- Que pase el siguiente.(hombre/ hombre o mujer)

-¿Quién es la siguiente?(mujer)