You’ll also see: first person implied.
Either way, those are funny terms. Aren’t they?
Implied first person writing means pronouns aren’t used. And instead of a pronoun, the sentence starts with an action verb. For example:
I leveraged an existing marketing system leading to a 15% increase in sales.
…becomes…
Leveraged an existing system leading to a 15% increase in sales.
The first is typical writing. The second is typical writing in a resume.