Refers to Japanese postpositional particles (cases, conjunctions, etc.). It is a term for the particles that mark relationships and connections in sentences.
日本語の『てにをは』は文の意味を決める重要な要素だ。
Japanese 'te-ni-wo-ha' (particles) are important elements that determine sentence meaning.
初級の学習者はまずてにをはの使い方を覚えるとよい。
Beginner learners should first learn how to use particles (てにをは).
作文を書くとき、てにをはの誤用に注意してください。
When writing an essay, be careful not to misuse particles.