Agnosticism

Oxford Dictionaries define agnostic (1):

A person who believes that nothing is known or can be known of the existence or nature of God or of anything beyond material phenomena; a person who claims neither faith nor disbelief in God.

Philosophy in Figures

varieties of atheism: gnostic theist/atheist; agnostic theist/atheist. Weak/Strong atheism. Explicit/Implicit atheism. — (a)theism vs (a)gnosticism source: (2)

Philosophy in Figures Ryan Reece explains the above diagram:

source: (3) ‘the know-ability issue is orthogonal [at right angles] to what one believes’.

References

(1) Oxford Dictionaries – agnostic https://en.oxforddictionaries.com/definition/us/agnostic

(2) Philosophy in Figures http://philosophy-in-figures.tumblr.com/post/88206026601/atheism-vs-agnosticism (accessed 12th September 2017)

(3) Philosophy in Figures http://disq.us/p/p9ed2j (accessed 12th September 2017)