Spirit of Truth
Capitalization and context of how this term is used result in three different meanings :
spirit of truth — the light given to everyone; a description of something sought after to help guide or answer;
Spirit of truth — an event in which the holy ghost ministers (as in an ordinance), or when Christ takes ownership over something as His; and
Spirit of Truth — a proper noun; a formal name for Christ, in the context of scripture.1
1 Email to Scripture Committee, May 1, 2018.