What does "this one" mean?

A specified object, thing or person (especially one nearby or known). (This entry is a translation hub.)

What is a synonym for "this one"?

Common synonyms include: blatz, buna, bura, burial-action context, bypast, changing system.

pron

pron ·Rare ·Advanced level

Pronoun

1
A specified object, thing or person (especially one nearby or known). (This entry is a translation hub.)
"Which one do you want? — This one!"
2
Refers to the speaker; I, me.
"please note: this one knows nothing about python. if the reader sees something that it is wrong about, they are encouraged to e-mail it. […]"

"Which one do you want? — This one!"